anonymous
  • anonymous
If f(x) = 2x + 4 and g(x) = (x^2 + x + 5), find g (f(x)).
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
whereever you see an x in the equation g(x) , replace it by (2x+4) ig g (f(x)) = (2x+4)^2 + (2x+4) +4
anonymous
  • anonymous
then you could expand, collect like terms , etc
anonymous
  • anonymous
instead of subing in just a single number into the function, you are subing a whole function into the function

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radar
  • radar
elecengineer, did you not the the 5 that was in the original g(x)????
anonymous
  • anonymous
dont quite understand what you meant ^ But yes looking back at it the last thing should be a 5 ie the answer is g (f(x)) = (2x+4)^2 +(2x+4) + 5
radar
  • radar
*the should of read need. Ok I see what you did. Thanks. I'm sure JAPAN1593 can finish it up now.
radar
  • radar
JAPAN1593, do you understand what to do to finish the problem?
anonymous
  • anonymous
yes thank you all

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