f(x) is any function and f -1(x) is known as inverse of f(x), then f -1(x) of f(x)=1/x +1 is
a) 1/x -1 b) x-1 c) 1/(x-1) d) 1/(x+1) e) none of these
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a) 1/x -1 b) x-1 c) 1/(x-1) d) 1/(x+1) e) none of these
ans: f(x) = 1/x + 1
=> 1/x =f(x) - 1
=>x=f(x) - 1
So the inverse is x -1 ans b
With all due respect, what z the meaning of the title of this post.... truely speaking this sort of easy qs never come in MAT forget abt CAT
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but one of the textbooks gives c as the answer.... just wanted to confirm
thanx a lot
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f(x)=1/x+1
1/x=f(x)-1
x=1/(f(x)-1)
thus inverse is 1/(x-1)
hence the answer is (c)
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Let,
y=f(x)
y=1/x+1
=>1/x=y-1
=>x=1/(y-1)
=>f-1(x)=1/(x-1)
Opton (c) is correct. No problem with the option.
P.S:@Alivia: Though Im not well acquainted MAT standard but I think this kind of demarcation is not applied for CAT. Anything from anywhere can come.
Giv ur best to the world.
Nd d best will cm back to u..
Regards,
Dipanjan....
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