How to find the derivative of 1/(x^2) using definition of the derivative;I know how to find it by using the power rule but not the definition.
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The definition of the derivative is: If then
So try doing that and come back and tell us how you did. We can help you if you still need help.
I need a hint, 'cause I'm still stuck.
Tell me what f(x+h) and f(x) are, then tell post what . Once you have all that you should be able to simplify things and take the derivative.
start by getting a common denominator and get those two fractions in the numerator together.
I keep getting lost during simplifying process.(what's wrong with me)
Originally Posted by wowo I keep getting lost during simplifying process. what's wrong with me can' say ... you haven't shown anything other than posting the problem.
start by getting these two fractions together ...
... note that the common denominator is .
Am I right????
Yes, continue simplification. Eventually an h will cancel.
Originally Posted by wowo
Am I right???? keep going ... clean it up
Okay, I'm completely lost with simplifying
Originally Posted by wowo Okay, I'm completely lost with simplifying
distribute the negative in the numerator and combine like terms ... then factor out an from what's left in the numerator ...
Originally Posted by wowo So, It's No. You have made a careless mistake in the numerator. Go back, check your work, find the mistake. Hint: You know what the final answer is meant to be, don't you ....?
Is it -2x+h/(x^2(x+h)^2 ??
Last edited by wowo; Oct 17th 2010 at 06:51 PM.
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