2x^2-4x-8=0怎么解啊

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2x^2-4x-8=0怎么解啊2x^2-4x-8=0怎么解啊2x^2-4x-8=0怎么解啊即x²-2x=4x²-2x+1=4+1(x-1)²=5x-1=±√5x=1-√5

2x^2-4x-8=0怎么解啊
2x^2-4x-8=0怎么解啊

2x^2-4x-8=0怎么解啊
即x²-2x=4
x²-2x+1=4+1
(x-1)²=5
x-1=±√5
x=1-√5,x=1+√5

2x^2-4x-8=0
x^2-2x-4=0
(x-1)^2=4+1
x-1=±√5
x=1±√5