x²-2x=4
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x²-2x=4
x^2-2x=4
x^2-2x+1=4+1
(x-1)^2=5
x-1=±√5
x1=√5+1
x2=-√5+1
x^2-2x=4
x^2-2x+1=4+1
(x-1)^2=5
x-1=±√5
x1=√5+1 或 x1’=-√5+1
x²-2x=4
x^2-2x=4
x^2-2x+1=4+1
(x-1)^2=5
x-1=±√5
x1=√5+1
x2=-√5+1
x^2-2x=4
x^2-2x+1=4+1
(x-1)^2=5
x-1=±√5
x1=√5+1 或 x1’=-√5+1