Question

3. Solve f(3) = x2 + 4

Answer 1

f(3) means substitute x by 3

`\begin{gathered} \because f(x)=x^2+4 \\ \therefore f(3)=(3)^2+4 \end{gathered}`

Find its value

`\begin{gathered} \therefore f(3)=9+4 \\ \therefore f(3)=13 \end{gathered}`