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apologiabiology
f o g is how it's written with the -3 it means

f(g(-3))=what

so first -3 into g(x)
g(-3)=-4(-3)
g(-3)=12

sub for x in f(x)
f(12)=-3(12)^2-5
f(12)=-3(144)-5
f(12)=-432-5
f(12)=-437

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