solve qudratic equations by factorisation 2xsquare-2x+1upon
2=0
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2x^2-2x-1/2=2x^2-x-x+1/2
=2x(x-1/2)-1(x-1/2)
=(2x-1) (x-1/2)
=2x(x-1/2)-1(x-1/2)
=(2x-1) (x-1/2)
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