Respuesta :

Answer:

a[b(x) ] = 3x - 39

Step-by-step explanation:

To calculate the composite function a [b(x) ], substitute x = b(x) into a(x)

a [b(x) ]

= a(x - 9)

= 3(x - 9) - 12 ← distribute parenthesis

= 3x - 27 - 12 ← collect like terms

= 3x - 39

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