Question

Find f(4) if f(x) = 3x + 13

Answer 1

We are given the linear function below:

$\large{f(x) = 3x + 13}$

To find f(4), simply substitute x = 4 in the equation.

$\large{f(4) = 3(4) + 13} \\ \large{f(4) = 12 + 13} \\ \large \boxed{f(4) = 25}$

Answer

• f(4) = 25