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

a.-9

b.-8

c. 7

d. 15

Just plug the number

_5 (5) + 40=-25+40

=15

f (x) = 15 d.

Step-by-step explanation:

To begin solving the equation you need to substitute - 5 in for x.

The equation would then read f (x) = 5 (-5) + 40

Then you need to simplify 5 times - 5 is - 25

the equation would be f (x) = -25+40

Then you would simplify and you will get f (x) = 15