Answer
$f(x^{2})=x^{2}+4$
$(f(x))^{2}=x^{2}+8x+16$
Work Step by Step
We are given:
$f(x)=x+4$
We evaluate:
$f(x^{2})=x^{2}+4$
$(f(x))^{2}=(x+4)^{2}=x^{2}+8x+16$
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