Question

Given the function f(x) = −2x2 + 4x − 7, find f(−4).
−55
−7
9
25

Answer 1

A. -55

Explanation:

f(x)=-2x^2+4x-7

f(-4)= -2(-4)^2+4(-4)-7

= -2(16)-18-7

= -32-16-7

= -55

Answer 2

-55

Explanation:

f(x) = −2x^2 + 4x − 7

Let x = -4

f(-4) = −2(-4)^2 + 4(-4) − 7

= -2 (16) -16 -7

= -32 -16 -7

=-55