Question

For the function f(x) = 2|5x + 7– 1, evaluate f(-4).

Answer 1

To evaluate f(x) at x = -4 we substiitute x in the equation with -4. Doing this gives

`f(-4)=2|5(-4)+7|-1`
`f(-4)=2|-20+7|-1`
`\begin{gathered} f(-4)=2|-13|-1 \\ f(-4)=2\cdot13-1 \end{gathered}`
`f(-4)=25`

which is our answer!