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If f(x)=g(g(x))-g(x) and g(x)=2x+1, find f(3).

 May 30, 2021
 #1
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f(3) = 25.

 May 30, 2021
 #2
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g ( 3 ) = 7

 

then   g (g(3) ) = g(7) = 15       then    f(x ) = 15 -7 = 8

 May 30, 2021

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