Question

已知x^2-2x+y^2+6y+10=0,求xy谢谢了,

Answer 1

x^2-2x+y^2+6y+10=0 x^2-2x+1+y^2+6y+9=0 (x-1)^2+(y+3)^2=0 因为平方数大于等于0,所以只有x-1=0,y+3=0时才满足方程. x=1,y=-3 , xy=-3