# Class 9 NCERT Solutions of Chapter 2-Polynomial

**The NCERT solutions of class 9 maths chapter 2- Polynomial** is a basic chapter of algebra. The **NCERT** **solutions of chapter 2-Polynomial** will help you in understanding the questions based on the different structures of **polynomials.** The **NCERT solutions of chapter 2-Polynomial** provide the use of all algebraic identities which are used in higher classes and also in other branches of **mathematics**. All the **NCERT** **solutions of chapter 2-Polynomial** are solved by an expert teacher of maths as per the CBSE norms.

Polynomial is an algebraic expression in which the degree of the variable is a whole number as an example x, x +1,x²+1, etc but constants like 1,2,3 3/2, etc are also supposed as a polynomial because we can write them x^{0},2x^{0},3x^{0},3x^{0}/2etc.In terms of the number of terms, polynomials are classified as monomial(single), binomial(two terms), trinomial(three terms), etc. In terms of degree, the polynomials are classified as linear polynomials (degree 1), quadratic polynomials (degree 2), cubic polynomials (degree 3), etc.

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Chapter 2 Polynomial of Class 9 contains 5 exercises

Exercise 2.1

Exercise 2.2

Exercise 2.3

Exercise 2.4

Exercise 2.5

**NCERT Solutions of all chapters of Maths for Class 10 from Chapters 1 to 15**

**NCERT Solutions of Class 9 Maths : from chapter 1 to 15**

**You can also see the video NCERT Solutions for Class 10 Maths Chapter 2 -Polinomial** updated for **2023-24 CBSE Board Exams**,these NCERT solutions are referred to Chapter- 2 Current maths NCERT text book.

**Class 9 maths NCERT Solutions of the chapter 2-Polynomial**

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### Exercise 2.1

**Q1. Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.**

**(i) 4x² –3x + 7**

**(ii) y² + √2**

**(iii) 3√t + t√2**

Ans. (i) 4x² –3x + 7

Hint: Polynomial is the algebraic expression in which the power of the variable is a whole number

The given expression is a polynomial in one variable x since each power of x (2,1,0) is a whole number

(ii) y² + √2

The given expression is polynomial in one variable y since each power of y (2,0) is a whole number

(iii) 3√t + t√2

The given expression is not a polynomial since the power of variable t is (1/2, 1) in which 1/2 is not a whole number

The given expression is not a polynomial since the power of variable y is (1, –1) in which –1 is not a whole number.

The given expression is a polynomial in three variables x,y, and t since each exponent of the variable is 10, 3, and 50 in which all are whole numbers.

**Q2.Write the coefficient of x² in each of the following.**

**(i) 2 + x² + x**

**(ii) 2 – x² + x³**

Ans.

(i) 2 + x² + x

In the given expression the term containing x² has the coefficient 1

(ii) 2 – x² + x³

In the given expression the term containing x² has the coefficient –1

In the given expression the term containing x² has the coefficient π/2.

In the given expression there is no any term x², so the coefficient of x² is 0.

**Q3. Give one example each of a binomial of degree 35, and a monomial of degree 100.**

Ans. Binomial of degree 35 is following

Monomial of degree 100 is following

**Q4. Write the degree of the following polynomial**

**(i) 5x³ + 4x² + 7x**

**(ii) 4 – y²**

**(iii)5t –√7**

**(iv) 3**

Ans.

(i) 5x³ + 4x² + 7x

The highest exponent of the variable x is 3, so the degree of the given polynomial is 3

(ii) 4 – y²

The highest exponent of the variable y in the expression is 2, so the degree of the polynomial is 2

(iii)5t –√7

The highest exponent of the variable t in the expression is 1, so the degree of the polynomial is 1

(iv) 3

There is no variable in the given term, so the degree of the polynomial is 0

**Q5. Classify the following as linear, quadratic, and cubic polynomial.**

**(i) x² + x**

**(ii) x – x³**

**(iii) y + y² + 4**

**(iv) 1 + x**

**(v) 3t**

**(vi) r²**

**(vii) 7x³**

Ans.

(i) x² + x

The given polynomial is of the degree 2, so it is a quadratic polynomial

(ii) x – x³

The given polynomial is of the degree 3, so it is a cubic polynomial

(iii) y + y² + 4

The given polynomial is of the degree 2, so the given polynomial is a quadratic polynomial

(iv) 1 + x

The given polynomial is of the degree 1, so the given polynomial is a linear polynomial

(v) 3t

The given polynomial is of the degree 1, so the given polynomial is a linear polynomial

(vi) r²

The given polynomial is of the degree 2, so the given polynomial is a quadratic polynomial

(vii) 7x³

The given polynomial is of the degree 3, so the given polynomial is a cubic polynomial

**See the video for exercise 2.1 solutions**

**Class 9 Maths NCERT Solutions of Chapter 2-Polynomial**

**Exercise 2.2**

**Q1. Find the value of polynomial 5x –4x² +3 at**

**(i) x = 0 (ii)x = –1 (iii) x = 2**

Ans. Let the given polynomial is expressed as p(x)

(i) x = 0

p(x) = 5x –4x² +3

p(0) = 5× 0 –4 × 0 + 3 = 3

(ii)x = –1

p(x) = 5x –4x² +3

p(–1) = 5 ×–1 – 4 (–1) ² + 3 = –5 –4 + 3 = –9 + 3 = –6

(iii) x = 2

p(x) = 5x –4x² +3

p(2) = 5 × 2 – 4 ×2² + 3 = 10 – 16 + 3 = –3

**Q2.Find p(0), p(1) and p(2) for each of the following polynomials**

**(i) p(y) = y² –y + 1**

**(ii) p(t) = 2 +t +2t² – t³**

**(iii) p(x) = x³**

**(iv) p(x) = (x +1)(x – 1)**

Ans.

(i) p(y) = y² –y + 1

p(0) = 0 – 0 +1 = 1

p(1) = 1² –1 + 1 = 1

p(2) = 2² –2 + 1 = 3

(ii) p(t) = 2 +t +2t² – t³

p(0) = 2 +0 +2×0² – 0³= 2

p(1) = 2 +1 +2×1² – 1³ = 3 +2 – 1 = 4

p(2)=2 +2 +2×2² – 2³ = 4 + 8 – 8 = 4

(iii) p(x) = x³

p(0) = 0³ = 0

p(1) = 1³ = 1

p(2) = 2³ = 8

(iv) p(x) = (x +1)(x – 1)

p(0) = (0+1)(0 – 1) = –1

p(1) = (1 +1)(1 – 1) = 0

p(2) = (2 +1)(2 – 1) = 3

**Q3. Verify whether the following are zeroes of the polynomial , indicated against them.**

Ans.

Since the value of the polynomial at x = – 1/3 is zero, so x = – 1/3 is the zero of the given polynomial

The value of the polynomial is not zero at the value ,x = 4/5, so x = 4/5 is not the zero of the given polynomial

p(1) = 1² – 1 = 0

The value of the polynomial at x = 1, is zero, so x = 1 is the zero of the given polynomial.

The value of the polynomial at x = –1/2, is not zero, so x = –1/2 is not the zero of the given polynomial.

p(0) = 0

The value of the polynomial at x = 0, is zero, so x = 0 is the zero of the given polynomial

The value of the polynomial at x = –m/l is zero, so x = –m/l is the zero of the given polynomial

The value of the polynomial at x = –1/l√3 is zero, so x = –1/√3 is the zero of the given polynomial

The value of the polynomial at x = 2/√3 is not zero, so x = 2/√3 is not the zero of the given polynomial

The value of the polynomial at x = 1/2 is not zero, so x = 1/2 is not the zero of the given polynomial

**Q4. Find the zero of the polynomial in each of the given cases.**

**(i) p(x) = x +5**

**(ii) p(x) = x – 5**

**(iii) p(x) = 2 x + 5**

**(iv) p(x) = 3x – 2**

**(v) p(x) = 3x**

**(vi) p(x) = ax, a ≠ 0**

**(vii) p(x) = cx + d, c ≠ 0 where c and d are real numbers**

Ans.

(i) p(x) = x +5

x +5 = 0

x = – 5

Hence the zero of the given polynomial is x =– 5

(ii) p(x) = x – 5

x – 5 = 0

x = 5

Hence the zero of the given polynomial is x = 5

(iii) p(x) = 2 x + 5

2 x + 5 = 0

Hence the zero of the given polynomial is – 5/2

(iv) p(x) = 3x – 2

3x – 2 = 0

Hence the zero of the given polynomial is 2/3

(v) p(x) = 3x

3x = 0

x = 0

Hence the zero of the given polynomial is 0

(vi) p(x) = ax, a ≠ 0

ax = 0

x = 0

Hence the zero of the given polynomial is 0

vii) p(x) = cx + d

cx + d = 0

Hence zero of the given polynomial is – d/c

**Class 9 Maths NCERT Solutions of Chapter 2-Polynomial**

**EXERCISE-2.3**

**Q1.Find the remainder when is divided by**

**(i) x**

**(iii) x**

**(iv) x+π**

**(v) 5+2x**

Ans.

(i) We have to divide the polynomial ** **by the polynomial x + 1

Let’s find the zero of the x = 0

x = – 1

Putting the value of x = – 1, in

= – 1 + 3 – 3 + 1 = 0

(ii) Dividing the polynomial ** **by **, **we can get the reminder in the following way

Putting the value in

(iii) Dividing the polynomial ** **by x, we can get the reminder by the following way

Putting x = 0 the zero of the polynomial x, in the given polynomial

0 + 0 + 0 +1 = 1

(iv) Dividing the polynomial ** **by x + π, we can get the reminder by the following way

x + π = 0

x = – π , is the zero of the polynomial x + π

Putting the value x = – π, in the given polynomial

The reminder is

(v) Dividing the polynomial ** **by 5 + 2x, we can get the reminder by the following way

5+2x = 0

, is the zero of the polynomial 5+2x

Putting the value of in the polynomial **, **we get the reminder

**Q2.Find the remainder when is divided by .**

The zero the polynomial x – a, is

x – a = 0

x = a

Putting this value in

a³ – a × a² + 6 × a – a

= a³ – a³ +6a – a = 5a

Therefore the required reminder is 5a

**Q3.Check whether is a factor of .**

The zero of the polynomial 7 + 3x is as follows

7 + 3x = 0

Putting this value of x in , we shall get the required reminder

**Class 9 Maths NCERT Solutions of Chapter 2-Polynomial**

**EXERCISE-2.4**

**Q1.Determine which of the following polynomials has a factor.**

**(i)**

**(ii)**

**(iii)**

**(iv)**

Ans.

(i)

The zero of the polynomial x + 1 is as follows

x + 1 = 0

x = – 1

Putting this value of x = – 1, in the given polynomial

(–1)³ + 1² + 1 + 1

– 1 + 1 + 1 + 1 = 2

Since value of the polynomial at x = – 1, is not zero so (x +1) is not the factor of the given polynomial

(ii)

The zero of the polynomial (x +1) is x + 1 = 0 ⇒ x = – 1

Putting x = – 1, in the given polynomial

= 1 – 1 + 1 – 1 + 1 = 1

Since value of the given polynomial at x = 1, is not zero,therefore (x +1) is not the factor of the given polynomial

(iii)

The zero of the polynomial (x +1) is x + 1 = 0 ⇒ x = – 1

Putting x = – 1, in the given polynomial

= 1 – 3 + 3 –1 +1 = 1

Since value of the given polynomial at x = 1, is not zero,therefore (x +1) is not the factor of the given polynomial

(iv)

The zero of the polynomial (x +1) is x + 1 = 0 ⇒ x = – 1

Putting x = – 1, in the given polynomial

The value of the polynomial at x = – 1 is not zero, so (x + 1) is not the factor of the given polynomial

**Q2. Use the Factor Theorem to determine whether g (x) is a factor of p (x) in each of the following cases**

**(i) p (x)= 2x ^{3} + x^{2} – 2x – 1, g (x) = x + 1**

**(ii) p(x)= x**

^{3}+ 3x^{2}+ 3x + 1, g (x) = x + 2**(iii) p (x) = x**

^{3}– 4x^{2}+ x + 6, g (x) = x – 3Ans. (i) p (x)= 2x^{3} + x^{2} – 2x – 1, g (x) = x + 1

x + 1 = 0

x = – 1

Putting the value of x = – 1 in the given polynomial

p(x) = 2x^{3} + x^{2} – 2x – 1

= 2× – 1 + 1 + 2 – 1

p(–1) = – 2 + 3 – 1 = 0

Since value of p(–1) is zero ,therefore g(x) is the factor of the given polynomial

(ii) p(x)= x^{3} + 3x^{2} + 3x + 1, g (x) = x + 2

x + 2 = 0

x = – 2

p(x)= x^{3} + 3x^{2} + 3x + 1

p(– 2) = (– 2)^{3} + 3(–2)² + 3 (– 2) +1 = -8 +12 -6 +1 = -1

Since the value of p(– 2) is not zero, therefore the given polynomial is not the factor of (x + 2)

(iii) p (x) = x^{3} – 4x^{2} + x + 6, g (x) = x – 3

x – 3 = 0

x = 3

Putting the value of x in the given polynomial

p(3) = 3³ –4× 3² + 3 + 6

= 27– 36 + 9

= 0

Since the value of p(3) is zero, so g(x) is the factor of p(x)

**Q3.Find the value of k, if x – 1 is a factor of p (x) in each of the following cases**

**(i) p (x) = x ^{2} + x + k**

**(ii) p (x) = 2x**

^{2}+ kx + √2**(iii) p (x) = kx**

^{2}– √2 x + 1**(iv) p (x) = kx**

^{2}– 3x + kAns.

For (x – 1) to be a factor of p(x), p(1) should be equal to 0.

(i) Here, p(x) = x^{2} + x + k

Since, p(1) = (1)^{2} +1 + k

⇒ p(1) = k + 2 = 0

⇒ k = -2.

(ii) Here, p (x) = 2x^{2} + kx + √2

Since, p(1) = 2(1)^{2} + k(1) + √2

= 2 + k + √2 =0

k = -2 – √2 = -(2 + √2)

(iii) Here, p (x) = kx^{2} – √2 x + 1

Since, p(1) = k(1)^{2} – (1) + 1

= k – √2 + 1 = 0

⇒ k = √2 -1

(iv) Here, p(x) = kx^{2} – 3x + k

p(1) = k(1)^{2} – 3(1) + k

= k – 3 + k

= 2k – 3 = 0

⇒ k =

**Q4. Factorise**

**(i) 12x ^{2} – 7x +1**

**(ii) 2x**

^{2}+ 7x + 3**(iii) 6x**

^{2}+ 5x – 6**(iv) 3x**

^{2}– x – 4Ans.

(i) We have,

12x

^{2}– 7x + 1 = 12x

^{2}– 4x- 3x + 1

= 4x (3x – 1 ) -1 (3x – 1)

= (3x -1) (4x -1)

Thus, 12x

^{2}-7x + 3 = (2x – 1) (x + 3)

(ii) We have, 2x^{2} + 7x + 3 = 2x^{2} + x + 6x + 3

= x(2x + 1) + 3(2x + 1)

= (2x + 1)(x + 3)

Thus, 2×2 + 7x + 3 = (2x + 1)(x + 3)

(iii) We have, 6x^{2} + 5x – 6 = 6x^{2} + 9x – 4x – 6

= 3x(2x + 3) – 2(2x + 3)

= (2x + 3)(3x – 2)

Thus, 6x^{2} + 5x – 6 = (2x + 3)(3x – 2)

(iv) We have, 3x^{2} – x – 4 = 3x^{2} – 4x + 3x – 4

= x(3x – 4) + 1(3x – 4) = (3x – 4)(x + 1)

Thus, 3x^{2} – x – 4 = (3x – 4)(x + 1)

**Q5. Factorise**

**(i) x ^{3} – 2x^{2} – x + 2**

**(ii) x**

^{3}– 3x^{2}– 9x – 5**(iii) x**

^{3}+ 13x^{2}+ 32x + 20**(iv) 2y**

^{3}+ y^{2}– 2y – 1Ans.

(i) We have, x

^{3}– 2x

^{2}– x + 2

Rearranging the terms, we have x

^{3}– x – 2x

^{2}+ 2

= x(x

^{2}– 1) – 2(x

^{2}-1) = (x

^{2}– 1)(x – 2)

= [(x)

^{2}– (1)

^{2}](x – 2)

= (x – 1)(x + 1)(x – 2)

[∵ (a

^{2}– b

^{2}) = (a + b)(a-b)]

Therefore , x

^{3}– 2x

^{2}– x + 2 = (x – 1)(x + 1)(x – 2)

(ii) We have, x^{3} – 3x^{2} – 9x – 5

= x^{3} + x^{2} – 4x^{2} – 4x – 5x – 5 ,

= x^{2} (x + 1) – 4x(x + 1) – 5(x + 1)

= (x + 1)(x^{2} – 4x – 5)

= (x + 1)(x^{2} – 5x + x – 5)

= (x + 1)[x(x – 5) + 1(x – 5)]

= (x + 1)(x – 5)(x + 1)

Therefore, x^{3} – 3x^{2} – 9x – 5 = (x + 1)(x – 5)(x +1)

(iii) We have, x^{3} + 13x^{2} + 32x + 20

= x^{3} + x^{2} + 12x^{2} + 12x + 20x + 20

= x^{2}(x + 1) + 12x(x +1) + 20(x + 1)

= (x + 1)(x^{2} + 12x + 20)

= (x + 1)(x^{2} + 2x + 10x + 20)

= (x + 1)[x(x + 2) + 10(x + 2)]

= (x + 1)(x + 2)(x + 10)

Therefore, x^{3} + 13x^{2} + 32x + 20

= (x + 1)(x + 2)(x + 10)

(iv) We have, 2y^{3} + y^{2} – 2y – 1

= 2y^{3} – 2y^{2} + 3y^{2} – 3y + y – 1

= 2y^{2}(y – 1) + 3y(y – 1) + 1(y – 1)

= (y – 1)(2y^{2} + 3y + 1)

= (y – 1)(2y^{2} + 2y + y + 1)

= (y – 1)[2y(y + 1) + 1(y + 1)]

= (y – 1)(y + 1)(2y + 1)

Therefore, 2y^{3} + y^{2} – 2y – 1

= (y – 1)(y + 1)(2y +1)

**See the video for Question (4) and Question (5)**

**Class 9 Maths NCERT Solutions of Chapter 2-Polynomial**

**Exercise 2.5**

**Q1.Use suitable identities to find the following products**

**(i) **

**(ii) **

**(iii)**

**(iv) **

Ans.

(i) (x + 4)( x+ 10)

**Q2.Evaluate the following products without multiplying directly:**

**(i)103×107**

**(ii)95×96**

**(iii)104× 96**

Ans.

(i)103×107

Modifying the given expression in form of (x + a)(x +b) as following

(103)×(107) = (100 +3)(100 +7)

(100 +3)(100 +7) = 100² +(3 +7)100 + 3×7 = 10000 +1000 + 21 = 110021

(ii) 95×96

95×96 = (100 – 5)(100 – 4)

(100 – 5)(100 – 4) = 100² +( – 5 – 4)100 +( – 4)( – 5)

10000 – 900 + 20 = 9120

(iii) 104× 96

(100 +4)(100 – 4)

(100 +4)(100 – 4) = 100² – 4² = 10000 – 16 = 9984

**Q3.Factorize the following using appropriate identities**

(i)

(ii)

(iii)

Ans.

(i)

Using the following identity

(ii)

(iii)

**Q4.Expand each of the following, using a suitable identity**

(i)

(ii)

(iii)

(iv)

(v)

(iv)

Ans.

(i)

(ii)

(iii)

(iv)

(v)

(iv)

**Q5.Factorise:**

(i)

(ii)

Ans.

(i)

Since the terms –24yz and –16xz, both are having negative sign, so the term z which is common between them must be negative

(ii)

**Q6.Write the following cubes in expanded form**

Ans.

Applying the following identity

=

=

Applying the following identity

Using the following identity

**Q7.Evaluate the following using suitable identities**

**(i)99³ (ii)102³ (iii) 998³ **

Ans.

(i)99³

Modifying 99 into (100– 1) and using the following identity

(x +y)³ = x³ + 3x²y + 3y²x + y³

= 1000000 – 30000 + 300 – 1

= 970299

** (ii)102³**

Modifying 102 into ( 100 +2) and using the following identity

(x +y)³ = x³ + 3x²y + 3y²x + y³

(100 +2)³ = 100³ + 3× 100² ×2 + 3×2²× 100 + 2³

= 1000000 + 60000 +1200 +8

=1061208

**(iii) 998³ **

Modifying the number 998 into (1000 – 2) and using the following identity

(x +y)³ = x³ + 3x²y + 3y²x + y³

(1000 –2)³ = 1000³ – 3× 1000² ×2 + 3×2²× 1000 – 2³

1000000000 –6000000 +12000 – 8

=994011992

**Q8.Factorise each of the following**

(1) 8a³ + b³ +12a²b + 6ab²

(ii) 8a³ – b³ – 12a²b + 6ab²

(iii) 27 – 125a³ – 135a + 225a²

(iv) 64a³ – 27b³ – 144a²b + 108b²a

Ans.

(1) 8a³ + b³ +12a²b + 6ab²

Using the following identity

(x + y)³ = x³ + y³ +3x²y + 3y²x

Modifying the given expression as following

(2a)³ + b³ +3×(2a)²×b + 3×b²×2a

= (2a + b)³

(ii) 8a³ – b³ – 12a²b + 6ab²

Using the following identity

(x – y)³ = x³ – y³ –3×x²×y + 3×y²×x

Modifying the given expression as following

(2a)³ – b³ –3×(2a)²×b + 3×b²×2a

= (2a – b)³

(iii) 27 – 125a³ – 135a + 225a²

Using the following identity

(x – y)³ = x³ – y³ –3×x²×y + 3×y²×x

27 – 125a³ – 135a + 225a²

= 3³ – (5a)³ –3×(3)²×5a + 3×(5a)²×5a

= (3 – 5a)³

(iv) 64a³ – 27b³ – 144a²b + 108b²a

(x – y)³ = x³ – y³ –3×x²×y + 3×y²×x

Modifying the given expression as following

(4a)³ – (3b)³ – 3×(4a)²×3b + 3×(3b)²× 4a

(4a – 3b)³

(x – y)³ = x³ – y³ –3×x²×y + 3×y²×x

Modifying the given expression as following

**Q9.Verify**

Ans.

Using the following identity

Using the following identity

Hence Proved

**Q10.Factorise each of the following**

Ans.

Modifying the given expression according to the identity

Modifying the given expression according to the identity

**Q11.Factorise**

Using the following identity

Modifying the given expression according to the identity

**Q12.Verify that**

Applying the following identity

Dividing and multiplying the RHS by 2

**Q13. If x + y + z = 0, show that x ^{3} + y^{3} + z^{3} = 3 xyz.**

Ans.

Using the following identity

Since, x + y + z = 0

x^{3} + y^{3} + z^{3} – 3 xyz = 0

x^{3} + y^{3} + z^{3} = 3 xyz

Hence if x + y + z = 0, then x^{3} + y^{3} + z^{3} = 3 xyz

See the video for Solutions of Question 1 to Question 13

**Q14.Without actually calculating the cubes, find the value of each of the following(i) (– 12) ^{3} + (7)^{3} + (5)^{3}(ii) (28)^{3} + (– 15)^{3} + (– 13)^{3}**

Ans.

(i) We have, (– 12)^{3} + (7)^{3} + (5)^{3}

Let x = – 12, y = 7 and z = 5

Then, x + y + z = – 12 + 7 + 5 = 0

We know that if x + y + z = 0, then, x^{3} + y^{3} + z^{3} = 3xyz

∴ (-12)^{3} + (7)^{3} + (5)^{3} = 3×– 12×7×5

= – 1260

(ii) We have, (28)^{3} + (–15)^{3} + (–13)^{3}

Let x = 28, y = –15 and z = – 13

Then, x + y + z = 28 – 15 – 13 = 0

We know that if x + y + z = 0, then x^{3} + y^{3} + z^{3} = 3xyz

∴ (28)^{3} + (–15)^{3} + (–13)^{3} = 3×28×–15×–13

= 16380

**Q15.Give possible expressions for the length and breadth of each of the following rectangles, in which their areas are given**

**(i) Area 25a ^{2} – 35a + 12**

**(ii) Area 35y**

^{2}+ 13y – 12Ans.

Area of a rectangle = Length x Breadth

(i) 25a^{2} – 35a + 12 = 25a^{2} – 20a – 15a + 12

= 5a(5a – 4) – 3(5a – 4) = (5a – 4)(5a – 3)

Thus, the possible length and breadth are (5a – 3) and (5a – 4).

(ii) 35y^{2}+ 13y -12 = 35y^{2} + 28y – 15y -12

= 7y(5y + 4) – 3(5y + 4) = (5 y + 4)(7y – 3)

Thus, the possible length and breadth are (7y – 3) and (5y + 4).

**Q16.What are the possible expressions for the dimensions of the cuboids whose volumes are given below?**

**(i) Volume 3x ^{2} – 12x**

**(ii) Volume 12ky**

^{2}+ 8ky – 20kAns.

Volume of a cuboid = Length x Breadth x Height

(i) We have, 3x

^{2}– 12x = 3(x

^{2}– 4x)

= 3 x x x (x – 4)

∴ The possible dimensions of the cuboid are 3, x and (x – 4).

(ii) We have, 12ky^{2} + 8ky – 20k

= 4[3ky^{2} + 2ky – 5k] = 4[k(3y^{2} + 2y – 5)]

= 4 x k x (3y^{2} + 2y – 5)

= 4k[3y^{2} – 3y + 5y – 5]

= 4k[3y(y – 1) + 5(y – 1)]

= 4k[(3y + 5) x (y – 1)]

= 4k x (3y + 5) x (y – 1)

Thus, the possible dimensions of the cuboid are 4k, (3y + 5) and (y -1).

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Chapter 1-Sets | Chapter 9-Sequences and Series |

Chapter 2- Relations and functions | Chapter 10- Straight Lines |

Chapter 3- Trigonometry | Chapter 11-Conic Sections |

Chapter 4-Principle of mathematical induction | Chapter 12-Introduction to three Dimensional Geometry |

Chapter 5-Complex numbers | Chapter 13- Limits and Derivatives |

Chapter 6- Linear Inequalities | Chapter 14-Mathematical Reasoning |

Chapter 7- Permutations and Combinations | Chapter 15- Statistics |

Chapter 8- Binomial Theorem | Chapter 16- Probability |

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Chapter 1-Relations and Functions | Chapter 9-Differential Equations |

Chapter 2-Inverse Trigonometric Functions | Chapter 10-Vector Algebra |

Chapter 3-Matrices | Chapter 11 – Three Dimensional Geometry |

Chapter 4-Determinants | Chapter 12-Linear Programming |

Chapter 5- Continuity and Differentiability | Chapter 13-Probability |

Chapter 6- Application of Derivation | CBSE Class 12- Question paper of maths 2021 with solutions |

Chapter 7- Integrals | |

Chapter 8-Application of Integrals |

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