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29 March, 10:37

Among all pairs of numbers whose sum is 20 find a pair whose product is as large as possible. what is the maximum product?

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  1. 29 March, 13:50
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    X+y+20 p=xy x=-20/-2=10

    y+20-x p=x (20-x) y=10

    p=-x^2+20x xy=100

    x=10

    xy=100

    x=10

    y=10 Max prod.=100
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