# How do you find the function values f(-1) given F(x) = -4x?

Aug 21, 2017

See a solution process below:

#### Explanation:

To find $f \left(- 1\right)$ substitute $\textcolor{red}{- 1}$ for each occurrence of $\textcolor{red}{x}$ in $F \left(x\right) = - 4 x$

$f \left(\textcolor{red}{x}\right) = - 4 \textcolor{red}{x}$ becomes:

$f \left(\textcolor{red}{- 1}\right) = - 4 \times \textcolor{red}{- 1}$

$f \left(\textcolor{red}{- 1}\right) = 4$