# How do you evaluate the function f(x)=3x-7  for x=4?

Oct 30, 2015

$5$

#### Explanation:

Substitute $4$ into the function everywhere that there is an $x$.

You would get

$3 \left(4\right) - 7$
$= 12 - 7$
$= 5$
$f \left(4\right) = 5$

$f \left(4\right)$ is the same thing as evaluating the function for $x = 4$.