- Choice B
$$ f(x)=x^2+1\ and\ g(x)=x-3 $$
$$ f(g(x))=x^2+1 $$
$$ f(x-3)=(x-3)^2+1 $$
$$ =x^2+9-6x+1 $$
$$ =x^2-6x+10 $$
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$$ f(x)=x^2+1\ and\ g(x)=x-3 $$
$$ f(g(x))=x^2+1 $$
$$ f(x-3)=(x-3)^2+1 $$
$$ =x^2+9-6x+1 $$
$$ =x^2-6x+10 $$
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