(y-3)²=9(y+2)²
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(y-3)²=9(y+2)²(y-3)²=9(y+2)²(y-3)²=9(y+2)²[3(y+2)]²-(y-3)²=0
(y-3)²=9(y+2)²
(y-3)²=9(y+2)²
(y-3)²=9(y+2)²
[3(y+2)]²-(y-3)²=0
[3(y+2)+(y-3)][3(y+2)-(y-3)]=0
(4y+3)(2y+9)=0
y=-3/4,y=-9/2
(y-3)²=9(y+2)²
(1)(y-3)=3(y+2)
y=-4.5
(2)(y-3)=-3(y+2)
y=-0.75
(y-3)²=9(y+2)²
9(y+2)²-(y-3)²
=(3y+6)^2-(y-3)^2
=(3y+6+y-3)(3y+6-y+3)
=(4y+3)(2y+9)=0
y=-3/4,-9/2
(y-3)²=(3y+6)²
(y-3)²-(3y+6)²=0
(y-3+3y+6)(y-3-3y-6)=0
(4y+3)(-2y-9)=0
y = -0.75,或者,y = -4.5