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Q.

lf f(x) is an invertible function and gx=2fx+5 then the value of g-1x is

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a

2f-1x-5

b

12f-1x+5

c

12f-1x+5

d

f-1x-52

answer is D.

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Detailed Solution

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