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Mathematics
Bradley Watson
2 September, 08:20
X^2-10x+y^2-20y=-125 what is x+y=?
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Greene
2 September, 10:10
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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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