(x²-x)²-8(x²-x)+12=0

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(x²-x)²-8(x²-x)+12=0
(x²-x)²-8(x²-x)+12=0

(x²-x)²-8(x²-x)+12=0
(x²-x)²-8(x²-x)+12=0
(x²-x-2)(x²-x-6)=0
x²-x-2=0或x²-x-6=0
(x-2)(x+1)=0或(x-3)(x+2)=0
解得x1=2 x2=-1 x3=3 x4=-2
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