Question 1119328
Piece-wise, plug in x=3 into g(x), plug that result into f(x):
g(3) = {{{ 3^3+8 = 35 }}}
and f(35) = {{{ root(3,35) }}}
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Composing  f o g(x) first, then plugging in x=3:
{{{ g(x) = x^3 + 8 }}}
and {{{ f(x^3+8) =  root(3, x^3+8) = f(g(x)) }}}

{{{ f(g(3)) = root(3, 3^3+8) = root(3,35) }}}