Question

乘法公式已知X²+Y²-6X+10Y+34=0.则X+Y的值是多少.加上步骤.谢谢诶.

Answer 1

X²+Y²-6X+10Y+34=X²-6x+9+Y²+10y+25=(x-3)^2+(y+5)^2=0

(x-3)^2=0,得x=3

(y+5)^2=0,得=-5

所以x+y=-2