Question

What is f(2) if f(x) = 2x-5 and f(4) if f(x) = -3x + 15
step by step please!

Answer 1

f(2) = - 1 and f(4) = 3

Explanation:

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

f(2) = 2(2) - 5 = 4 - 5 = - 1

To evaluate f(4), substitute x = 4 into f(x)

f(4) = - 3(4) + 15 = - 12 + 15 = 3