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Questions  

 If f(x) is an invertible function and g(x)=2f(x)+5, then  the value of g1(x) is 

a
2f−1(x)−5
b
12f−1(x)+5
c
12f−1(x)+5
d
f−1x−52

detailed solution

Correct option is D

Replacing x by g−1(x) , we get x=2fg−1(x)+5∴ fg−1(x)=x−52∴ g−1(x)=f−1x−52

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