Question: Given the functions a(x) = 3x 12 and b(x) = x 9, solve a[b(x)] and select the correct answer below. a[b(x)] = 3x2 21 a[b(x)]

Given the functions a(x) = 3x 12 and b(x) = x 9, solve a[b(x)] and select the correct answer below.

a[b(x)] = 3x2 21

a[b(x)] = 3x2 39

a[b(x)] = 3x 21

a[b(x)] = 3x 39

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