Question

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

Answer 1

we have the following:

`f\mleft(x\mright)=5x+40`

replacing, x = -5

`\begin{gathered} f(-5)=5\cdot-5+40 \\ =-25+40 \\ =15 \end{gathered}`

The answer is 15