Question

Find f(5) and f(-1) for the equation:

f(x)= -2x + 2

A.-8 and 1
B.-8 and -1
C.-8 and 4
D.-8 and 2

Answer 1

-8 and 4

Explanation:

Put x as 5 and solve.

f(5) = -2(5) + 2

f(5) = -10 + 2

f(5) = -8

Put x as -1 and solve.

f(-1) = -2(-1) +2

f(-1) = 2 +2

f(-1) = 4

Answer 2

C. -8 and 4

Explanation:

Step 1: Plug in f(5)

f(5) = -2(5) + 2

f(5) = -10 + 2

f(5) = -8

Step 2: Plug in f(-1)

f(-1) = -2(-1) + 2

f(-1) = 2 + 2

f(-1) = 4