f:x→4x−1
f:x→4x+1
f:x→4x−14
f:x→x−12
Correct answer is A
The inverse of the inverse of a function gives the function
i.e f−1(f−1(x))=f(x)
f−1(x)=x+14
Take y = x, so
f−1(y)=y+14
Let x=f−1(y),
x=y+14⟹4x=y+1
y=f(x)=4x−1
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