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= (2x-3)^2 -2(2x-3) + 1=
4x^2-12x+9-4x+6+1
= 4x^2-16x+16
= x^2-4x+4
=(x-2) (x-2) =0
x-2
= (2x-3)(2x-3) -4x + 6 + 1
= 4x² -6x -6x + 9 - 4x + 7
= 4x² - 16x + 16