SOLUTION: Use composition to prove that f(x)=x+7/-2 is the inverse of g(x)=-2x-7

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Question 369852: Use composition to prove that f(x)=x+7/-2 is the inverse of g(x)=-2x-7
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
g%28f%28x%29%29+=+-2%28%28x%2B7%29%2F-2%29-7+=+%28x%2B7%29-7+=+x. Also
f%28g%28x%29%29+=+%28%28-2x-7%29%2B7%29%2F-2+=+%28-2x%29%2F-2+=+x. Therefore f is the inverse function of g.