>Could someone please tell me the answer to this: >if f'(x) = x^(-1) what is f(x)? > >I know it is very basic but I can't seem to work out the >answer.
It would help if you showed how you tried to do that, or what text you perhaps used. The answer is f(x) = ln(x).
Thanks Alex. Someone asked me what it was. The method I used was the same as if you knew f'(x) was 2x, you know by moving the 2 that f(x) is x^2 plus c.
No, I did something stupid by not putting c right away. But since you eventually did, my not putting in c might have confused you. I just apologised and added a c.
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