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If f(x) = 3x2 and g(x) = V2«, what is the value of (fog)(8)?

If f(x) = 3x2 and g(x) = V2«, what is the value of (fog)(8)?-example-1

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The argument of a square root must be greater or equal to 0, then:


\begin{gathered} x-5\ge0 \\ \Rightarrow x\ge5 \end{gathered}

From the given values for x (5, 1, -5 and 0), the only one that satisfies this inequality is x=5.

Therefore, the answer is:


A\text{. x=5}

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