Question

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

Answer 1

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}`