(x-2)平方=9(x+3)平方
所以
(x-2)平方-9(x+3)平方=0
【(x-2)-3(x+3)】【(x-2)+3(x+3)】=0
(-2x-11)(4x+7)=0
x=-11/2或x=-7/4
(x-2)平方=9(x+3)平方
(x-2)平方-9(x+3)平方 =0
[(x-2)+3(x+3)][(x-2)-3(x+3)]=0
(4x+7)(-2x-11)=0
x1=-7/4, x2=-11/2
(x-2)²=9(x+3)²
(x-2)²=(3x+9)²
(3x+9)²-(x-2)²=0
(3x+9+x-2)(3x+9-x+2)=0
(4x+7)(2x+11)=0
4x+7=0,或2x+11=0
x=-7/4,或x=-11/2