Seeking minimun value

Algebra Level 4

If x y + 1 0 , xy+1\geq 0, then what is the minimum value of x 2 + y 2 + 6 x 6 y ? x^{2}+y^{2}+6x-6y?

-12 -11 -10 -9

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1 solution

黄 J
Dec 17, 2017

(Sorry! My English is too poor to explain this question thoroughly. I hope the following picture can help you to understand a way to solve this.)

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