(x-1)(x+3)+2(X+3)=8
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![(x-1)(x+3)+2(X+3)=8](/uploads/image/z/5208961-49-1.jpg?t=%28x-1%29%28x%2B3%29%2B2%28X%2B3%29%3D8)
(x-1)(x+3)+2(X+3)=8
(x-1)(x+3)+2(X+3)=8
(x-1)(x+3)+2(X+3)=8
x²+2x-3+2x+6=8
x²+4x-5=0
(x+5)(x-1)=0
x=-5,x=1
(x-1)(x+3)+2(X+3)=8
x²+2x-3+2x+6=8
x²+4x-5=0
(x-1)(x+5)=0
x=1或x=-5
这个题有两个答案,分别是1和-5
(x-1)(x+3)+2(X+3)=8是错的,(x-1)(x+3)+2(X+3)应该等于2x+9