In the problem f(x) = -1/x^2+1 finding the derivative using the quotient rule. the solution would be -x^2+2x-1/(x^2+1)^2? It seems right but im not sure.
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Originally Posted by oregon88 In the problem f(x) = -1/x^2+1 finding the derivative using the quotient rule. the solution would be -x^2+2x-1/(x^2+1)^2? It seems right but im not sure. I don't get that answer, perhaps you could post your working? Wolfram gets the same answer I do. If you are unsure about how to use the quotient rule here the chain rule works equally well Spoiler: By the chain Rule:
Last edited by e^(i*pi); May 17th 2010 at 01:02 PM. Reason: more descriptive
Is what I came up with
Originally Posted by oregon88 Is what I came up with Hold on, you said in the OP. Which one is correct? Your differentiating is correct but your simplification on the third line is not - there should be no x term. Plus be more clear with your syntax using brackets
The original problem is Sorry about that, I see where I messed up on the third line I did not factor the (-x)(2x) on my paper. Thanks for the help e^(i*pi)
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