KVPY SA Exam 2012 Question Paper

Question : 1 of 80

Marks: +1, -0

PART I(One-Mark Questions)

MATHEMATICS

Let f(x) be a quadratic polynomial with f(2) = 10 and f(-2) = -2. Then the coefficient of x in f(x) is

Solution:

say

f (x) =ax^2+ bx+ c

f (x) =ax^2+ bx+ c

f (2) =4a +2b +c= 10

f ( -2) =4a -2b +c =-2

⇒4b= 12

b= 3

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