AP Calc

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

  • AP Calc -

    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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