factorise x square - 4 x + 1
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Hey mate ,
x^2-4x+1
D = √ (b^2 - 4ac)
= √ ( 16-4)
= √12
= 2√3
Thus , by quadratic formula
x = -b +-√D / 2a
= +4+-2√3 /2
= 2[ 2 +-√3] /2
= 2+-√3
x = 2+√3 , 2-√3
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