Answer:
g(f(z)) = 7z² + 42z + 63
Explanation:
to find g(f(z)), substitute z = f(z) into g(z) , that is
g(f(z))
= g(z + 3)
= 7(z + 3)² ← expand factor using FOIL
= 7(z² + 6z + 9) ← distribute parenthesis by 7
= 7z² + 42z + 63
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