25(x+2)²—36=0 求x

问题描述:

25(x+2)²—36=0 求x

(x+2)²=36/25
x+2=±6/5
x1=-4/5 x2=16/5

25(x+2)²=36
(x+2)²=36/25
x+2=6/5 x+2=-6/5
x=-4/5或-16/5

25(x+2)²—36=0
[5(x+2)-6][5(x+2)+6]=0
(5x+10-6)(5x+10+6)=0
5x+4=0 5x+16=0
x=-4/5或x=-16/5

25(x+2)²=36
(x+2)²=36/25
x+2=6/5 x+2=-6/5
x=-4/5 x=-16/5