Question

Use the given function f(x) = (x-4) +8x to solve f(-2)

A. 18
B. 14
C. 22
D. -22

Answer 1

we just need to substitute the x by -2 in the function:
f(x) = (x - 4) + 8x
f(-2) = (-2 - 4) + 8(-2)
f(-2) = (-6) - 16
f(-2) = -6 - 16
f(-2) = -22