# How do you evaluate the function f(x) = 3x – 2, when x = –1?

Jul 8, 2015

Replacing $x$ with $\left(- 1\right)$ and performing standard arithmetic gives
$\textcolor{w h i t e}{\text{XXXX}}$$f \left(- 1\right) = - 5$

#### Explanation:

If $f \left(x\right) = 3 x - 2$

when the variable $x$ is replace with an actual value $\left(- 1\right)$
we get
$\textcolor{w h i t e}{\text{XXXX}}$$f \left(- 1\right) = 3 \left(- 1\right) - 2$
$\textcolor{w h i t e}{\text{XXXX}}$$\textcolor{w h i t e}{\text{XXXX}}$$= - 3 - 2$
$\textcolor{w h i t e}{\text{XXXX}}$$\textcolor{w h i t e}{\text{XXXX}}$$= - 5$