If-f-x-2x-and-ff-x-x-1-then-x-

Question Number 6186 by sanusihammed last updated on 17/Jun/16

I f f (x) = 2 x a n d f f (x) = x + 1

t h e n x = ?

Commented by Rasheed Soomro last updated on 17/Jun/16

I f f (x) = 2 x a n d f f (x) = x + 1

t h e n x = ?

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f (x) = 2 x \Rightarrow f (f (x)) = f (2 x) = 2 (2 x) = 4 x \dots . (i)

B u t f (f (x)) = x + 1 \dots . (i i)

F r o m (i) & (i i)

4 x = x + 1

x = \frac{1}{3}

Commented by sanusihammed last updated on 17/Jun/16

T h a n k y o u s o m u c h