Question

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

Answer 1

f(x)= 15 because 5 times -5 is -25 and -25+40 is 15

Answer 2

Answer: 15

Explanation:

Given function:
`\text{f(x)}=5x+40`

To find
`\text{f(x)}` when x=-5, we need to substitute the value of x in the given function, then we get

`\text{f(-5)}=5(-5)+40`

Simplify:

`\Rightarrow\text{f(-5)}=-25+40=40-25`

`\Rightarrow\text{f(-5)}=15`

Therefore, when x=-5, then the value of f(x)=15.