(x^2-1)^2-5(x^2-1)+6=0

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(x^2-1)^2-5(x^2-1)+6=0
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(x^2-1)^2-5(x^2-1)+6=0
(x^2-1)^2-5(x^2-1)+6=0

(x^2-1)^2-5(x^2-1)+6=0
a=x^2-1
a^2-5a+6=0
(a-2)(a-3)=0
a=2或a=3
x^2-1=2
x=±√3
x^2-1=3
x=±2

(x^2-1)^2-5(x^2-1)+6=0
（x²-1-2)(x²-1-3)=0
(x²-3)(x²-4)=0
(x+√3)(x-√3)(x+2)(x-2)=0
x=-√3或x=√3或x=2或x=-2

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