Question

Use the following function rule to find f(3). f(x) = 4x + 12 f(3) = ?

Answer 1

We can find f(3) by replacing the input value x with 3:

$\begin{gathered} f(x)=4x+12 \\ f(3)=4\cdot3+12=12+12=24 \end{gathered}$

The value of f(3) is 24.