Answer
$(f\circ g)(x) = 3x^2-3$
Work Step by Step
Recall:
$(f \circ g)(x)=f\left(g(x)\right)$
Use the rule/definition above to obtain:
\begin{align*}
(f \circ g)(x) &=f\left(g(x)\right)\\
&=3(x^2-1)\\
&=3x^2-3
\end{align*}
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