(x²-3x)²-2x²+6x-8=0

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(x²-3x)²-2x²+6x-8=0
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(x²-3x)²-2x²+6x-8=0
(x²-3x)²-2x²+6x-8=0

(x²-3x)²-2x²+6x-8=0
(x²-3x-4)(x²-3x+2)=0
(x-4)(x+1)(x-2)(x-1)=0
x=4,x=-1,x=2,x=1
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(x²-3x)²-2x²+6x-8=0
(x²-3x)²-2(x²-3x)-8=0
(x²-3x-4)(x²-3x+2)=0
(x-4)(x+1)(x-2)(x-1)=0
x=4 x=-1 x=2 x=1

(x²-3x)²-2x²+6x-8=0
(x²-3x-4)(x²-3x+2)=0
(x-4)(x+1)(x-2)(x-1)=0
x=4,x=-1,x=2,x=1