Hello from MrBillDoesMath!
Answer:
f(g(x)) = 12x
g(f(x)) = 12x
Discussion:
f(g(x)) = f ( 4x) = 3 * (4x) = 12x
g(f(x)) = g (3x) = 4 * (3x) = 12x
Thank you,
MrB
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