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3. Solve f(3) = x2 + 4

User Herik
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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}

User Anirban Saha
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