Question

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

answer
1. -9
2. -8
3. 7
4. 15

Answer 1

f(x) = 5x + 40

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

= 15

Ans: 15

Answer 2

option 4

Explanation:

f(x) = 5x + 40

f(x = - 5) = 5 ( - 5) + 40

= - 25 + 40

= 15