NCERT Solutions for class 10 Maths Chapter 2- Polynomials Exercise 2.3

NCERT Solutions for Class 10 Maths Exercise 2.3 Chapter 2 Polynomials which are provided here with details are prepared by our subject experts. These solutions are created and then reviewed by the NCERT subject experts to make it easy for the students to easily grasp the concept. This ensures that these NCERT Solutions are easily understandable by the class 10 Maths students.

Division Algorithm for polynomials is explained in the Solutions of Chapter 2 Polynomials Class 10 Maths NCERT Exercise 2.3. These solutions are prepared by keeping in mind that all NCERT guidelines shall be followed.  It is also taken care of that whole syllabus shall be covered while providing the solution so that the student shall not miss out on any concept.

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NCERT Solutions for Class 10 Maths Chapter 2- Polynomials Exercise 2.3

1. Divide the polynomial p(x) by the polynomial g(x) and find the quotient and remainder in each of the following:

(i)p(x) = x3-3x2+5x–3 , g(x) = x2–2

Solution:Given,

Dividend = p(x) = x3-3x2+5x–3

Divisor = g(x) = x2– 2

Ncert solutions class 10 chapter 2-2

Therefore, upon division we get,

Quotient = x–3

Remainder = 7x–9

(ii) p(x) = x4-3x2+4x+5 , g(x) = x2+1-x

Solution: Given,

Dividend = p(x) = x4 – 3x2 + 4x +5

Divisor = g(x) = x2 +1-x

Ncert solutions class 10 chapter 2-3

Therefore, upon division we get,

Quotient = x2 +x–3

Remainder = 8

(iii) p(x) =x4–5x+6, g(x) = 2–x2

Solution: Given,

Dividend = p(x) =x4 – 5x + 6 = x4 +0x2–5x+6

Divisor = g(x) = 2–x2 = –x2+2

Ncert solutions class 10 chapter 2-4

Therefore, upon division we get,

Quotient = -x2-2

Remainder = -5x + 10

2. Check whether the first polynomial is a factor of the second polynomial by dividing the second polynomial by the first polynomial:

(i) t2-3, 2t4 +3t3-2t2-9t-12

Solutions: Given,

First polynomial = t2-3

Second polynomial = 2t4 +3t3-2t2 -9t-12

Ncert solutions class 10 chapter 2-5

As we can see, the remainder is left as 0. Therefore, we say that, t2-3 is a factor of 2t2+3t+4.

(ii)x2+3x+1 , 3x4+5x3-7x2+2x+2

Solutions: Given,

First polynomial = x2+3x+1

Second polynomial = 3x4+5x3-7x2+2x+2

Ncert solutions class 10 chapter 2-6

As we can see, the remainder is left as 0. Therefore, we say that, x2 + 3x + 1 is a factor of 3x4+5x3-7x2+2x+2.

(iii) x3-3x+1, x5-4x3+x2+3x+1

Solutions: Given,

First polynomial = x3-3x+1

Second polynomial = x5-4x3+x2+3x+1

Ncert solutions class 10 chapter 2-7

As we can see, the remainder is not equal to 0. Therefore, we say that, x3-3x+1 is not a factor of x5-4x3+x2+3x+1 .

3. Obtain all other zeroes of 3x4+6x3-2x2-10x-5, if two of its zeroes are √(5/3) and – √(5/3).

Solutions: Since this is a polynomial equation of degree 4, hence there will be total 4 roots.

√(5/3) and – √(5/3) are zeroes of polynomial f(x).

(x –√(5/3)) (x+√(5/3) = x2-(5/3) = 0

(3x2−5)=0, is a factor of given polynomial f(x).

Now, when we will divide f(x) by (3x2−5) the quotient obtained will also be a factor of f(x) and the remainder will be 0.

Ncert solutions class 10 chapter 2-8

Therefore, 3x+6x−2x−10x–5 = (3x–5)(x2+2x+1)

Now, on further factorizing (x2+2x+1) we get,

x2+2x+1 = x2+x+x+1 = 0

x(x+1)+1(x+1) = 0

(x+1)(x+1) = 0

So, its zeroes are given by: x= −1 and x = −1.

Therefore, all four zeroes of given polynomial equation are:

√(5/3),- √(5/3) , −1 and −1.

Hence, is the answer.

4. On dividing x3-3x2+x+2 by a polynomial g(x), the quotient and remainder were x–2 and –2x+4, respectively. Find g(x).

Solutions:Given,

Dividend, p(x) = x3-3x2+x+2

Quotient = x-2

Remainder = –2x+4

We have to find the value of Divisor, g(x) =?

As we know,

Dividend = Divisor×Quotient + Remainder

∴ x3-3x2+x+2 = g(x)×(x-2)+(-2x+4)

x3-3x2+x+2-(-2x+4) = g(x)×(x-2)

Therefore, g(x) × (x-2) = x3-3x2+x+2

Now, for finding g(x) we will divide x3-3x2+x+2 with (x-2)

Ncert solutions class 10 chapter 2-9

Therefore, g(x) = (x2–x+1)

5. Give examples of polynomials p(x), g(x), q(x) and r(x), which satisfy the division algorithm and

(i) deg p(x) = deg q(x)

(ii) deg q(x) = deg r(x)

(iii) deg r(x) = 0

Solutions: According to the division algorithm, dividend p(x) and divisor g(x) are two polynomials, where g(x)≠0. Then we can find the value of quotient q(x) and remainder r(x), with the help of below given formula;

Dividend = Divisor×Quotient+Remainder

∴ p(x) = g(x)×q(x)+r(x)

Where r(x) = 0 or degree of r(x)< degree of g(x).

Now let us proof the three given cases as per division algorithm by taking examples for each.

(i):deg p(x) = deg q(x)

Degree of dividend is equal to degree of quotient, only when the divisor is a constant term.

Let us take an example, 3x2+3x+3 is a polynomial to be divided by 3.

So, (3x2+3x+3)/3 = x2+x+1 = q(x)

Thus, you can see, the degree of quotient is equal to the degree of dividend.

Hence, division algorithm is satisfied here.

(ii):deg q(x) = deg r(x)

Let us take an example , p(x)=x2+x is a polynomial to be divided by g(x)=x.

So, (x2+x)/x = x+1 = q(x)

Also, remainder, r(x) = 0

Thus, you can see, the degree of quotient is equal to the degree of remainder.

Hence, division algorithm is satisfied here.

(iii):deg r(x) = 0

The degree of remainder is 0 only when the remainder left after division algorithm is constant.

Let us take an example, p(x) = x2+1 is a polynomial to be divided by g(x)=x.

So,( x2+1)/x= x=q(x)

And r(x)=1

Clearly, the degree of remainder here is 0.

Hence, division algorithm is satisfied here.

The NCERT solutions for class 10 maths chapter 2 Exercise 2.3 is the third exercise of Chapter polynomials of class 10. Polynomials are introduced in class 9 and this is discussed more in details in class 10 by studying the Division Algorithm for Polynomials.

  • Division Algorithm for Polynomials – It includes five questions in which the first, second and fifth one has three subparts each.

Key Features of NCERT Solutions for Class 10 Maths Chapter 2- Polynomials Exercise 2.3

  • These NCERT Solutions let you solve and revise all questions of this particular exercise 2.3 and thereby understanding the concept better.
  • You will be able to fetch good marks after going through the step-wise solutions given by our subject expert teachers.
  • It helps in scoring well in the Maths exams.
  • It follows NCERT guidelines which help in preparing the students accordingly.
  • It contains all the important questions from the examination point of view.

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