Something's going over my head. These are the steps when I attempt to do the problem, but the book's answer is Please and thank you.
Last edited by Remriel; Mar 18th 2013 at 02:45 PM.
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Originally Posted by Remriel Look so the derivative is .
Originally Posted by Plato Look so the derivative is . Oh, I see. Thanks! I didn't realize I had to simplify the expression before I took the derivative.
You did not. Both methods work equally well. The problem occurs in your 3rd line: you didn't distribute the x^2 to the second part. So when that evalautes to -2(1), it should actually be, -2x^2.
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