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posted by Yuri Sunday, March 25, 2012 at 1:38am.

If y=2x-2 , what is the minimum value of the product xy? A. -16 B. -8 C. -4 D. 0 E. 2

z = xy = 2(x^2-x) dz/dx = 0 at min = 2(2x-1) x = 1/2 y = -1 xy = -1/2

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