# How do you find f(-3) given f(x)=2x+2?

Mar 12, 2018

$f \left(- 3\right) = - 4$

#### Explanation:

Simply substitute the value of $- 3$ given. In other words, $f \left(- 3\right)$ is the function of $f \left(x\right)$, however in this case, $x$ is $- 3$

$f \left(- 3\right) = 2 \left(- 3\right) + 2$

Distribute $2$ through the parenthesis

$f \left(- 3\right) = - 6 + 2$

Simplify

$f \left(- 3\right) = - 4$

Mar 12, 2018

$- 4$

#### Explanation:

We can substitute $- 3$ for $x$ and simplify:
$f \left(x\right) = 2 x + 2$
$f \left(- 3\right) = 2 \left(- 3\right) + 2$
$f \left(- 3\right) = - 6 + 2$
$f \left(- 3\right) = - 4$
So $f \left(- 3\right) = - 4$.