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Math Help - Simple derivative problem

  1. #1
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    Simple derivative problem




    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; March 18th 2013 at 01:45 PM.
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  2. #2
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    Re: Simple derivative problem

    Quote Originally Posted by Remriel View Post

    Look x^2(1-2x)=x^2-2x^3 so the derivative is 2x-6x^2.
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  3. #3
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    Re: Simple derivative problem

    Quote Originally Posted by Plato View Post
    Look x^2(1-2x)=x^2-2x^3 so the derivative is 2x-6x^2.
    Oh, I see. Thanks! I didn't realize I had to simplify the expression before I took the derivative.
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    Re: Simple derivative problem

    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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