Question

If f(x) = 5х + 40, what is f(x) when x=-5?

Answer 1

15

Explanation:

Substitute x = - 5 into f(x)

f(- 5) = 5(- 5) + 40 = - 25 + 40 = 15

Answer 2

replace x with the givin number and solve for f(x) answer is 15