anonymous
  • anonymous
Given the functions f(x) = 7x + 13 and g(x) = x + 2, which of the following functions represents f[g(x)] correctly?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
f[g(x)] = 7x + 15 f[g(x)] = 7x + 27 f[g(x)] = 7x2 + 15 f[g(x)] = 7x2 + 27
welshfella
  • welshfella
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welshfella
  • welshfella
you replace the x in f(x) by g(x)

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anonymous
  • anonymous
So the answer would be C?
welshfella
  • welshfella
then simplify
welshfella
  • welshfella
no
welshfella
  • welshfella
the 7 multiplies the whole of x + 2 not just the x
anonymous
  • anonymous
alright to be honest I still dont quite understand, and I dont want you to just give me the answer but im confused
welshfella
  • welshfella
instead of x we have x +2 so its 7(x + 2) + 13 the x+2 must be put into parentheses
welshfella
  • welshfella
now distribute the 7 over the x = 2 in the parentheses
welshfella
  • welshfella
* x + 2
anonymous
  • anonymous
ohh alright that makes it easier, seeing the actual equation written out helped
anonymous
  • anonymous
7x+14+13?
welshfella
  • welshfella
yea
welshfella
  • welshfella
now add 13 and 14 and you have it
anonymous
  • anonymous
alright so the answer is B. Thank you so much for your help :). Ill give you a medal
welshfella
  • welshfella
yes B is correct
anonymous
  • anonymous
Thank you so much for your help!

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