Asked by Neil

1. Let f(x)= x^2 - 5 and g(x)= 3x^2. Find g(f(x)).
2. Let f(x)= x^2 - 4 and g(x)= -3x^2. Find f(g(x)).
Answered by MathMate
g(f(x))=g(x^2-5)=3(x^2-5)^2
Expand and simplify.

Similar for #2.
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