Question

If f(x)=2x-8 and g(x)=sqrtx-5, what is (f。g)(30)?

Answer 1

\[f(x)=2x-8\\
g(x)=\sqrt x-5\]
So,
\[\begin{align*}(f\circ g)(x)&=f(g(x))\\
&=2\left(\sqrt x-5\right)-8\\
&=2\sqrt x-18
\end{align*}\]