lim ((x+h)^-2 - x^-2)/h as h->0 - Wolfram|Alpha

I don't know where the answer is coming from. What are the missing steps?

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- September 17th 2011, 10:02 AMStuck Mandifferentiating a function from first principles
lim ((x+h)^-2 - x^-2)/h as h->0 - Wolfram|Alpha

I don't know where the answer is coming from. What are the missing steps? - September 17th 2011, 10:06 AMStuck ManRe: differentiating a function from first principles
I have found I have done this question before. It involves making a common denominator.

- September 17th 2011, 10:06 AMProve ItRe: differentiating a function from first principles
- September 17th 2011, 12:17 PMskeeterRe: differentiating a function from first principles

finish it ...