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#1 umhellothere

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Posted 01 October 2008 - 05:45 PM

On a suitable set of real numbers, functions f and g are defined by f (x) = 1/x+2 and g (x) = (1/x) - 2

Find f(g(x)) in its simplest form.



I tried this and got x as the answer.

I'm not sure if its right so if anyone can tell me where im going wrong/right it would be great! Thanks.



Sorry for being a compulsive poster but i can't afford to fail at higher maths unsure.gif

#2 Steve

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Posted 02 October 2008 - 09:31 AM

If f (x) = \frac{1}{x+2} then you're right, but the way you've written it, f (x) = \frac{1}{x}+2 in which case you're wrong (remember BODMAS)!

I hope this helps. smile.gif
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