Understanding Polynomials

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If $f(x)=x^{3}-1$ and $g(x)=x^{2}+1$ , what is ?

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Explanation

is a composite function where is plugged into :

$f(2)=(2)^{3}-1=8-1=7$

$g(7)=(7)^{2}+1=49+1=50$

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