# What is the value of f(5) for the function f(x) = 3x - 4?

Mar 18, 2018

See a solution process below:

#### Explanation:

To find $f \left(5\right)$ substitute $\textcolor{red}{5}$ for each occurrence of $\textcolor{red}{x}$ in $f \left(x\right)$:

$f \left(\textcolor{red}{x}\right) = 3 \textcolor{red}{x} - 4$ becomes:

$f \left(\textcolor{red}{5}\right) = \left(3 \times \textcolor{red}{5}\right) - 4$

$f \left(\textcolor{red}{5}\right) = 15 - 4$

$f \left(\textcolor{red}{5}\right) = 11$