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

User Romano
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7 votes
24 because you plug in the 3 with the x so 4 times 3 which is 12 plus another 12 equals 24
User Paulin
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6 votes

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.

User Bobby Norton
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