(1+x)²-9=0(x+2)(x+3)=(x+3)
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![(1+x)²-9=0(x+2)(x+3)=(x+3)](/uploads/image/z/2806452-36-2.jpg?t=%EF%BC%881%2Bx%29%26%23178%3B-9%3D0%EF%BC%88x%2B2%29%28x%2B3%29%3D%28x%2B3%EF%BC%89)
(1+x)²-9=0(x+2)(x+3)=(x+3)
(1+x)²-9=0
(x+2)(x+3)=(x+3)
(1+x)²-9=0(x+2)(x+3)=(x+3)
(1)
(1+x+3)(1+x-3)=0
(x+4)(x-2)=0
∴x=-4 或x=2
(2)
(x+2)(x+3)-(x+3)=0
(x+3)(x+2-1)=0
(x+3)(x+1)=0
∴x=-3 x=-1
X=2或-4 第二个拆开 再合并 最好成了(x+1)(x+3)=0 得x=-1或-3