factorise the following expressions 4x square - 8 x + 4
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4x^2 - 8x +4= 0
4(x^2 -2x +1) =0
x^2 - 2x + 1 =0
x^2 -(1+1)x + 1=0
x^2 -x -x +1=0
x(x-1) -1(x-1)=0
(x-1) =0
x=1
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