RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 2. Polynomials

Subject: Maths - Class 10th

Q. No. 24 of CCE - Formative Assessment

Listen NCERT Audio Books to boost your productivity and retention power by 2X.

24

What should be added to the polynomial x2 – 5x + 4, so that 3 is the zero of the resulting polynomial?

Given;


p(x) = x2 – 5x + 4


3 is the zero of the resulting polynomial


So we have;


p(3) = (3)2 – 5×3 + 4


p(3) = 9 – 15 + 4


p(3) = – 2


As – 2 is the remainder,


So 2 should be added to the given polynomial to get 3 as the zero of the resulting polynomial.


We can also verify the answer;


By adding 2 to the given polynomial we get;


P(x) = x2 – 5x + 4 + 2


P(x) = x2 – 5x + 6


P(3) = 9 – 15 + 6


P(3) = 15 – 15


P(3) = 0


Hence prooved that 2 is the right answer to get 3 as the zero of resulting polynomial.

Chapter Exercises

More Exercise Questions

8

The sum and product of the zeros of a quadratic polynomial are and — 3 respectively. What is the quadratic polynomial?