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29 August, 10:51

X^2-10x+y^2-20y=-125 what is x+y=?

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  1. 29 August, 10:59
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    Complete the square gives you

    (x-5) ^2 + (y-10) ^2=0.

    Either x-5=0 or y-10=0, so the solutions are x=5 and y=10.

    5+10=15, your answer
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