# Evaluate ƒ(x) = –4x – 5 for x = –1.?

## A. -9 B. 4 C. 1 D. -1 pls help

Mar 14, 2018

See a solution process below:

#### Explanation:

For each occurrence of $\textcolor{red}{x}$ in $f \left(x\right)$ substitute $\textcolor{red}{- 1}$ and calculate the result:

$f \left(\textcolor{red}{x}\right) = - 4 \textcolor{red}{x} - 5$ becomes:

$f \left(\textcolor{red}{- 1}\right) = \left(- 4 \times \textcolor{red}{- 1}\right) - 5$

$f \left(\textcolor{red}{- 1}\right) = 4 - 5$

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