若XY满足(X+3)平方+根号下Y-2=0试求2X+3Y
问题描述:
若XY满足(X+3)平方+根号下Y-2=0试求2X+3Y
答
由题意知:
(x +3)^2 + 根号下(Y-2) = 0;
又 (x +3)^2 >=0,且 根号下(Y-2) >= 0,
故有:x + 3 =0,y - 2 =0,
所以:x = -3,y = 2;
即:2x +3y = -6 +6 =0.