anonymous
  • anonymous
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
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
anyy help
anonymous
  • anonymous
anonymous
  • anonymous

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anonymous
  • anonymous
@Vocaloid i am your 200th fan the least u could do is help me out
Vocaloid
  • Vocaloid
a(x) = 3x - 12 a((b(x)) = 3*b(x) - 12 = 3(x-9) - 12
anonymous
  • anonymous
what do i do
Vocaloid
  • Vocaloid
a(x) = 3x - 12, right? a(b(x)) means replace "x" with b(x), so a(b(x)) = 3*b(x) - 12 now, we know that b(x) = x - 9, so we can replace "b(x)" with (x-9), giving us a(b(x)) = 3(x-9)-12 distribute the 3 and simplify
anonymous
  • anonymous
3x-39 ?? @Vocaloid
Vocaloid
  • Vocaloid
yes

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