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Given f(x)=2^x and g(x)=f(x-3)+4, write the new function rule (equation) for function g and describe (using words*) the two transformations that occur between function f and function g.

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Answer:

  • The first thing we do is find out what f(x-3) is

  • f(x)=2^x\\f(x-3)=2^(x-3) this is can be simplified using the rules of exponents

  • f(x-3)=2^(x-3)\\f(x-3)=2^x/2^3\\f(x-3)=(2^(x))/(8)
  • Then we put that into g(x)

  • g(x)=f(x-3)+4\\g(x)=(2^(x))/(8)+4
  • The first transformation is at f(x), where it is divided by 8, and then inserted into g(x) which increases the new transformed f(x) by 4
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