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Mar 6, 2009 | 07:56 AM

#26

Pete

Civilian

Joined: Jun 2003

Posts: 8,407

Likes: 1

From: Miami Beach. FL

Thanks Red X, your explanation was good. I did it a bit differently though:

x²(72-4x)

2x (72-4x) + x² (-4)

144x - 8x² - 4x²

144x - 12x²

12x(12-x)

I totally forgot about the product rule for derivatives.

Last edited by Pete; Mar 6, 2009 at 07:57 AM.

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