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4 July, 08:21

Two numbers have a difference of 28. What is the sum of their squares if it is a minimum?

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  1. 4 July, 09:24
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    Now the square of x is x^2 and the square of x + 28 is (x+28) ^2.

    The sum of the squares is x^2 + (x + 28) ^2.

    x^2 + (x + 28) ^2

    = x^2 + x^2 + 28^2 + 56x

    = 2x^2 + 28^2 + 56x

    Now let f (x) = 2x^2 + 28^2 + 56x
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