solve the quadratic equation x²-4x+1=0 by completing Square method
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x^2 - 4x = -1
x^2 - 2×1 ×2 + 2^2 =-1 + 2^2
(x-2)^2 = -1 +4
x-2 = +-√3
X=√3+2 or X = -√3+2
x^2 - 2×1 ×2 + 2^2 =-1 + 2^2
(x-2)^2 = -1 +4
x-2 = +-√3
X=√3+2 or X = -√3+2
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