Can someone explain to me where the (-1/x^2) comes from in step 2 and why?

It is in the attached image.

Thanks for any input.

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- January 22nd 2009, 09:56 AMjlmills5prove f(x) is constant
Can someone explain to me where the (-1/x^2) comes from in step 2 and why?

It is in the attached image.

Thanks for any input. - January 22nd 2009, 10:05 AMPlato
- January 22nd 2009, 10:13 AMjlmills5
of course. thank you.