For F(x) = -4x how do you find f(3a)?

Mar 22, 2017

See the entire solution process below:

Explanation:

To find $f \left(3 a\right)$ substitute $\textcolor{red}{3 a}$ for every occurrence of $\textcolor{red}{x}$ in the function:

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

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

$f \left(\textcolor{red}{3 a}\right) = - 12 a$