Question

Let f(x) be a quadratic polynomial with $f\left(2\right)=10$ and $f(-2)=-2$, Then the coefficient of x in f(x) is

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is C 3

$f\left(x\right)=a{x}^2+bx+c$
$10=4a+2b+c$ ........... (1)
$-2=4a-2b+c$ ......... (2)
$12=4b\Rightarrow b=3$