NCERT Exemplar Class 10 Maths Chapter 2 Polynomials are provided here for students to practice and prepare for the board exam. The exemplar will help students get answers to all the difficult problems and also practice well before the exams. Students can also conduct last minute revision for any class test or even the board exams. In essence, students will be able to study productively and be well prepared to solve any question related to this chapter.

## Class 10 Maths NCERT Exemplar For Polynomials

In this chapter, students will learn to solve exemplar problems based on polynomials and its subtopics like;

- Geometrical Meaning of the Zeroes of a Polynomial
- Division Algorithm for Polynomial
- Zeroes and Coefficients of a Polynomial and their relationships

In NCERT Exemplar Class 10 Maths Chapter 2 of class 10 maths, students will learn about the concept of polynomials which has been discussed in depth. Students will also study important topics like the relationship between coefficients and zeroes, the division algorithm for Polynomials and geometrical meaning of the zeroes of a polynomial. As students need to be thorough with these topics, free NCERT exemplar for class 10 maths chapter 2 â€“ polynomials is provided here.

The exemplars for chapter 2 Polynomials are provided in PDF format, which can be downloaded easily. Students can use these solved questions as a reference tool while preparing for the exam to clear their doubts. These exemplar problems and solutions have been designed by experts with respect to CBSE Syllabus(2018-2019) and as per the example questions available in NCERT book.

Students of the 10th standard can also go through the online learning materials such as notes, exemplar books, question papers available in downloadable pdf format to do the preparations and tend to score well in the exam. To solve exemplars for all chapters click here. They are also advised to solve sample papers and previous year question papers to get an idea of the type of questions asked from chapter Polynomials and marking scheme for the same.

Students can check out class 10 maths chapter 2 NCERT Exemplar PDF below.

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### Access Answers of NCERT Exemplar Class 10 Maths Chapter 2 Polynomials

## Exercise 2.1

**Choose the correct answer from the given four options in the following questions:**

**1. If one of the zeroes of the quadratic polynomial ( kâ€“1) x^{2} + k x + 1 is â€“3, then the value of k is**

**(A) 4/3 (B) -4/3**

**2/3 (D) -2/3**

**Solution:**

(A) 4/3

Explanation:

According to the question,

-3 is one of the zeros of quadratic polynomial (k-1)x^{2}+kx+1

Substituting -3 in the given polynomial,

(k-1)(-3)Â²+k(-3)+1=0

(k-1)9+k(-3)+1 = 0

9k-9-3k+1=0

6k-8=0

k=8/6

Therefore, k=4/3

Hence, **option (A)** is the correct answer.

**2. A quadratic polynomial, whose zeroes are â€“3 and 4, is**

**(A) x^{2} â€“ x + 12 (B) x^{2} + x + 12**

**(C) (x ^{2}/2)-(x/2)-6 (D) 2x^{2} + 2x â€“24**

**Solution:**

(C) (x^{2}/2)-(x/2)-6

Explanation:

Sum of zeroes, Î±+ Î²= -3+4 =1

Product of Zeroes, Î±Î² = -3Ã— 4 -12

Therefore, the quadratic polynomial becomes,

xÂ²- (sum of zeroes)x+(product of zeroes)

= xÂ²- (Î±+ Î²)x+(Î±Î²)

= xÂ² – (1)x + (-12)

= xÂ² – x -12

Hence, **option (C)** is the correct answer.

**3. If the zeroes of the quadratic polynomial x^{2} + (a + 1) x + b are 2 and â€“3, then**

**(A) a = â€“7, b = â€“1 (B) a = 5, b = â€“1**

**(C) a = 2, b = â€“ 6 (D) a = 0, b = â€“ 6**

**Solution:**

(D)* a *= 2, *b *= â€“ 6

Explanation:

According to the question,

xÂ² + (a+1)x + b

Given that, the zeroes of the polynomial = 2 and -3,

When x = 2

2Â² + (a+1)(2) + b = 0

4 + 2a+2 + b = 0

6 + 2a+b = 0

2a+b = -6 —– (1)

When x = -3,

(-3)Â² + (a+1)(-3) + b = 0

9 – 3a-3 + b = 0

6 – 3a+b = 0

-3a+b = -6 —– (2)

Subtracting equation (2) from (1)

2a+b – (-3a+b) = -6-(-6)

2a+b+3a-b = -6+6

5a = 0

a = 0

Substituting the value of â€˜aâ€™ in equation (1), we get,

2a + b = -6

2(0) +b = -6

b = -6

Hence, **option (D)** is the correct answer.

**4. The number of polynomials having zeroes as â€“2 and 5 is**

**(A) 1 (B) 2 **

**(C) 3 (D) more than 3**

**Solution:**

(D) more than 3

Explanation:

According to the question,

The zeroes of the polynomials = -2 and 5

We know that the polynomial is of the form,

p(x) = ax^{2} + bx + c.

Sum of the zeroes = – (coefficient of x) Ã· coefficient of x^{2} i.e.

Sum of the zeroes = – b/a

– 2 + 5 = – b/a

3 = – b/a

b = – 3 and a = 1

Product of the zeroes = constant term Ã· coefficient of x^{2} i.e.

Product of zeroes = c/a

(- 2)5 = c/a

– 10 = c

Substituting the values of a, b and c in the polynomial p(x) = ax^{2} + bx + c.

We get, x^{2} – 3x – 10

Therefore, we can conclude that x can take any value.

Hence, **option (D)** is the correct answer.

**5. Given that one of the zeroes of the cubic polynomial ax^{3} + bx^{2} + cx + d is zero, the product of the other two zeroes is**

**(A) (â€“c/a) (B) c/a**

**(C) 0 (D) (â€“b/a)**

**Solution:**

(B) (c/a)

Explanation:

According to the question,

We have the polynomial,

*ax*^{3} + *bx*^{2} + *cx *+ *d*

We know that,

Sum of product of roots of a cubic equation is given by c/a

It is given that one root = 0

Now, let the other roots be Î±, Î²

So, we get,

Î±Î² + Î²(0) + (0)Î± = c/a

Î±Î² = c/a

Hence the product of other two roots is c/a

Hence, **option (B)** is the correct answer

Â

## Exercise 2.2

**1. Answer the following and justify:**

**(i) Can x^{2} â€“ 1 be the quotient on division of x^{6} + 2x^{3} + x â€“ 1 by a polynomial in x of degree 5?**

**Solution:**

No, x^{2} – 1 cannot be the quotient on division of x^{6} + 2x^{3} + x – 1 by a polynomial in x of degree 5.

Justification:

When a degree 6 polynomial is divided by degree 5 polynomial,

The quotient will be of degree 1.

Assume that (x^{2} – 1) divides the degree 6 polynomial with and the quotient obtained is degree 5 polynomial (1)

According to our assumption,

(degree 6 polynomial) = (x^{2} – 1)(degree 5 polynomial) + r(x) [ Since, (a = bq + r)]

= (degree 7 polynomial) + r(x) [ Since, (x^{2} term Ã— x^{5} term = x^{7} term)]

= (degree 7 polynomial)

From the above equation, it is clear that, our assumption is contradicted.

x^{2} – 1 cannot be the quotient on division of x^{6} + 2x^{3} + x – 1 by a polynomial in x of degree 5

Hence Proved.

**(ii) What will the quotient and remainder be on division of ax^{2} + bx + c by px^{3} + qx^{2} + rx + s, p**

**â‰**

*0?***Solution:**

Degree of the polynomial px^{3} + qx^{2} + rx + s is 3

Degree of the polynomial ax^{2} + bx + c is 2

Here, degree of px^{3} + qx^{2} + rx + s is greater than degree of the ax^{2} + bx + c

Therefore, the quotient would be zero,

And the remainder would be the dividend = ax^{2} + bx + c.

**(iii) If on division of a polynomial p (x) by a polynomial g (x), the quotient is zero, what is the relation between the degrees of p (x) and g (x)?**

**Solution:**

We know that,

p(x)= g(x) Ã— q(x)+r(x)

According to the question,

q(x) =0

When q(x)=0, then r(x) is also = 0

So, now when we divide p(x) by g(x),

Then p(x) should be equal to zero

Hence, the relation between the degrees of p (x) and g (x) is the degree p(x)<degree g(x)

**(iv) If on division of a non-zero polynomial p (x) by a polynomial g (x), the remainder is zero, what is the relation between the degrees of p (x) and g (x)?**

**Solution:**

In order to divide p(x) by g(x)

We know that,

Degree of p(x) > degree of g(x)

or

Degree of p(x)= degree of g(x)

Therefore, we can say that,

The relation between the degrees of *p *(*x*) and *g *(*x*) is degree of p(x) > degree of g(x)

**(v) Can the quadratic polynomial x^{2} + kx + k have equal zeroes for some odd integer k > 1?**

**Solution:**

A Quadratic Equation will have equal roots if it satisfies the condition:

bÂ² – 4ac = 0

Given equation is xÂ² + kx + k = 0

a = 1, b = k, x = k

Substituting in the equation we get,

kÂ² – 4 ( 1 ) ( k ) = 0

kÂ² – 4k = 0

k ( k – 4 ) = 0

k = 0 , k = 4

But in the question, it is given that k is greater than 1.

Hence the value of k is 4 if the equation has common roots.

Hence if the value of k = 4, then the equation ( xÂ² + kx + k ) will have equal roots.

Â

## Exercise 2.3

**Find the zeroes of the following polynomials by factorisation method.**

**1. 4 x^{2} â€“ 3x â€“ 1 **

**Solution:**

4*x*^{2} â€“ 3*x *â€“ 1

Splitting the middle term, we get,

4x^{2}-4x+1x-1

Taking the common factors out, we get,

4x(x-1) +1(x-1)

On grouping, we get,

(4x+1)(x-1)

So, the zeroes are,

4x+1= 0â‡’ 4x=-1 â‡’x= (-1/4)

(x-1) = 0 â‡’ x=1

Therefore, zeroes are (-1/4) and 1

Verification:

Sum of the zeroes = – (coefficient of x) Ã· coefficient of x^{2}

Î± + Î² = – b/a

1 – 1/4 = – (- 3)/4 = Â¾

Product of the zeroes = constant term Ã· coefficient of x^{2}

Î± Î² = c/a

1(- 1/4) = – Â¼

– 1/4 = – 1/4

**2. 3 x^{2} + 4x â€“ 4**

**Solution:**

3x^{2} + 4x â€“ 4

Splitting the middle term, we get,

3x^{2} + 6x – 2x â€“ 4

Taking the common factors out, we get,

3x(x+2) -2(x+2)

On grouping, we get,

(x+2)(3x-2)

So, the zeroes are,

x+2=0 â‡’ x= -2

3x-2=0â‡’ 3x=2â‡’x=2/3

Therefore, zeroes are (2/3) and -2

Verification:

Sum of the zeroes = – (coefficient of x) Ã· coefficient of x^{2}

Î± + Î² = – b/a

– 2 + (2/3) = – (4)/3

= – 4/3 = – 4/3

Product of the zeroes = constant term Ã· coefficient of x^{2}

Î± Î² = c/a

Product of the zeroes = (- 2) (2/3) = – 4/3

**3. 5 t^{2} + 12t + 7 **

**Solution:**

5t^{2} + 12t + 7

Splitting the middle term, we get,

5t^{2} +5t + 7t + 7

Taking the common factors out, we get,

5t (t+1) +7(t+1)

On grouping, we get,

(t+1)(5t+7)

So, the zeroes are,

t+1=0 â‡’ y= -1

5t+7=0 â‡’ 5t=-7â‡’t=-7/5

Therefore, zeroes are (-7/5) and -1

** **Verification:

Sum of the zeroes = – (coefficient of x) Ã· coefficient of x^{2}

Î± + Î² = – b/a

(- 1) + (- 7/5) = – (12)/5

= – 12/5 = – 12/5

Product of the zeroes = constant term Ã· coefficient of x^{2}

Î± Î² = c/a

(- 1)(- 7/5) = – 7/5

– 7/5 = – 7/5

**4. t^{3} â€“ 2t^{2} â€“ 15t**

**Solution:**

*t*^{3} â€“ 2*t*^{2} â€“ 15*t*

Taking t common, we get,

t ( t^{2} -2t -15)

Splitting the middle term of the equation t^{2} -2t -15, we get,

t( t^{2} -5t + 3t -15)

Taking the common factors out, we get,

t (t (t-5) +3(t-5)

On grouping, we get,

t (t+3)(t-5)

So, the zeroes are,

t=0

t+3=0 â‡’ t= -3

t -5=0 â‡’ t=5

Therefore, zeroes are 0, 5 and -3

** **Verification:

Sum of the zeroes = – (coefficient of x^{2}) Ã· coefficient of x^{3}

Î± + Î² + Î³ = – b/a

(0) + (- 3) + (5) = – (- 2)/1

= 2 = 2

Sum of the products of two zeroes at a time = coefficient of x Ã· coefficient of x^{3}

Î±Î² + Î²Î³ + Î±Î³ = c/a

(0)(- 3) + (- 3) (5) + (0) (5) = – 15/1

= – 15 = – 15

Product of all the zeroes = – (constant term) Ã· coefficient of x^{3}

Î±Î²Î³ = – d/a

(0)(- 3)(5) = 0

- = 0

**5. 2 x^{2} +(7/2)x +3/4**

**Solution:**

2*x*^{2} +(7/2)*x *+3/4

The equation can also be written as,

8x^{2}+14x+3

Splitting the middle term, we get,

8x^{2}+12x+2x+3

Taking the common factors out, we get,

4x (2x+3) +1(2x+3)

On grouping, we get,

(4x+1)(2x+3)

So, the zeroes are,

4x+1=0 â‡’ x = -1/4

2x+3=0 â‡’ x = -3/2

Therefore, zeroes are -1/4 and -3/2

Verification:

Sum of the zeroes = – (coefficient of x) Ã· coefficient of x^{2}

Î± + Î² = – b/a

(- 3/2) + (- 1/4) = – (7)/4

= – 7/4 = – 7/4

Product of the zeroes = constant term Ã· coefficient of x^{2}

Î± Î² = c/a

(- 3/2)(- 1/4) =Â (3/4)/2

3/8 = 3/8

Â

## Exercise 2.4

**1. For each of the following, find a quadratic polynomial whose sum and product respectively of the zeroes are as given. Also find the zeroes of these polynomials by factorisation.**

**(i) (â€“8/3), 4/3**

**(ii) 21/8, 5/16**

**(iii) -2âˆš3, -9**

**(iv) (-3/(2âˆš5)), -Â½**

**Solution:**

(i) Sum of the zeroes = – 8/3

Product of the zeroes = 4/3

P(x) = x^{2}Â – (sum of the zeroes) + (product of the zeroes)

Then, P(x)= x^{2}Â – 8x/3 + 4/3

P(x)= 3x^{2}Â – 8x + 4

Using splitting the middle term method,

3x^{2}Â – 8x + 4 = 0

3x^{2}Â – (6x + 2x) + 4 = 0

3x^{2}Â – 6x – 2x + 4 = 0

3x(x – 2) – 2(x – 2) = 0

(x – 2)(3x – 2) = 0

â‡’Â x = 2, 2/3

(ii) Sum of the zeroes = 21/8

Product of the zeroes = 5/16

P(x) = x^{2}Â – (sum of the zeroes) + (product of the zeroes)

Then, P(x)= x^{2}Â – 21x/8 + 5/16

P(x)= 16x^{2}Â – 42x + 5

Using splitting the middle term method,

16x^{2}Â – 42x + 5 = 0

16x^{2}Â – (2x + 40x) + 5 = 0

16x^{2}Â – 2x – 40x + 5 = 0

2x (8x – 1) – 5(8x – 1) = 0

(8x – 1)(2x – 5) = 0

â‡’Â x = 1/8, 5/2

(iii) Sum of the zeroes = – 2âˆš3

Product of the zeroes = – 9

P(x) = x^{2}Â – (sum of the zeroes) + (product of the zeroes)

Then, P(x) = x^{2}Â – 2âˆš3x-Â 9

Using splitting the middle term method,

x^{2}Â – 2âˆš3x – 9 = 0

x^{2}Â – (- âˆš3x + 3âˆš3x) – 9 = 0

x^{2}Â + âˆš3x – 3âˆš3x – 9 = 0

x(x + âˆš3) – 3âˆš3(x + âˆš3) = 0

(x + âˆš3)(x – 3âˆš3) = 0

â‡’Â x = – âˆš3, 3âˆš3

(iv) Sum of the zeroes =Â -3/2âˆš5x

Product of the zeroes = – Â½

P(x) = x^{2}Â – (sum of the zeroes) + (product of the zeroes)

Then, P(x)= x^{2}Â -3/2âˆš5x – Â½

P(x)= 2âˆš5x^{2}Â – 3x – âˆš5

Using splitting the middle term method,

2âˆš5x^{2}Â – 3x – âˆš5 = 0

2âˆš5x^{2}Â – (5x – 2x) – âˆš5 = 0

2âˆš5x^{2}Â – 5x + 2x – âˆš5 = 0

âˆš5x (2x – âˆš5) – (2x – âˆš5) = 0

(2x – âˆš5)(âˆš5 – 1) = 0

â‡’Â x = – 1/âˆš5, âˆš5/2

**2. Given that the zeroes of the cubic polynomial x^{3} â€“ 6x^{2} + 3x + 10 are of the form a, a + b, a + 2b for some real numbers a and b, find the values of a and b as well as the zeroes of the given polynomial.**

**Solution:**

Given that a, a+b, a+2b are roots of given polynomial xÂ³-6xÂ²+3x+10

Sum of the roots â‡’ a+2b+a+a+b = -coefficient of xÂ²/ coefficient of xÂ³

â‡’ 3a+3b = -(-6)/1 = 6

â‡’ 3(a+b) = 6

â‡’ a+b = 2 ——— (1) b = 2-a

Product of roots â‡’ (a+2b)(a+b)a = -constant/coefficient of xÂ³

â‡’ (a+b+b)(a+b)a = -10/1

Substituting the value of a+b=2 in it

â‡’ (2+b)(2)a = -10

â‡’ (2+b)2a = -10

â‡’ (2+2-a)2a = -10

â‡’ (4-a)2a = -10

â‡’ 4a-aÂ² = -5

â‡’ aÂ²-4a-5 = 0

â‡’ aÂ²-5a+a-5 = 0

â‡’ (a-5)(a+1) = 0

a-5 = 0 or a+1 = 0

a = 5 a = -1

a = 5, -1 in (1) a+b = 2

When a = 5, 5+b=2 â‡’ b=-3

a = -1, -1+b=2 â‡’ b= 3

âˆ´ If a=5 then b= -3

or

If a= -1 then b=3

**3. Given that **âˆš**2 is a zero of the cubic polynomial 6 x^{3} + **âˆš

**2**âˆš

*x*^{2}â€“ 10*x*â€“ 4**2 , find its other two zeroes.**

**Solution:**

Given, âˆš2 is one of the zero of the cubic polynomial.

Then, (x-âˆš2) is one of the factor of the given polynomial p(x) = 6xÂ³+âˆš2xÂ²-10x- 4âˆš2.

So, by dividing p(x) by x-âˆš2

6xÂ³+âˆš2xÂ²-10x-4âˆš2= (x-âˆš2) (6xÂ² +7âˆš2x + 4)

By splitting the middle term,

We get,

(x-âˆš2) (6xÂ² + 4âˆš2x + 3âˆš2x + 4)

= (x-âˆš2) [ 2x(3x+2âˆš2) + âˆš2(3x+2âˆš2)]

= (x-âˆš2) (2x+âˆš2) Â Â (3x+2âˆš2)

To get the zeroes of p(x),

Substitute p(x)= 0

(x-âˆš2) (2x+âˆš2) Â (3x+2âˆš2)= 0

x= âˆš2 , x= -âˆš2/2 ,x= -2âˆš2/3

which is equal to,

x= âˆš2 , x= -1 /âˆš2 ,x= -2âˆš2/3 [Rationalising second zero]

Hence, the other two zeroes of p(x) are -1/âˆš2 and -2âˆš2/3

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