Question

Evaluate Functions
Given f(x) = 2x + 6 and g(x) = 5x - 1
Evaluate f(-2)

Answer 1

f(-2) = -4x + 6

Explanation:

f(x) = 2x + 6

f(-2) = -2(2x) + 6

f(-2) = -4x + 6

Answer 2

f(- 2) = 2

Explanation:

To evaluate f(- 2), substitute x = - 2 into f(x), that is

f(- 2) = 2(- 2) + 6 = - 4 + 6 = 2