Answer
$f(x)=x+3$
$g(x)=3x+4$
Work Step by Step
$f(g(x))=(3x+4)^2+3$ which is $g(x)^2+3$
Therefore, there are multiple solutions.
Two possible solutions are:
$g(x)=3x+4$
and $f(x)=x+3$
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