(2x-3)²-8x+12 factorise the term
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(a-b)^2=a^2-2ab+b^2
(2x-3)^2-8x+12=4x^2-12x +9-8x+12
= 4x^2-20x+21
(2x-3)^2-8x+12=4x^2-12x +9-8x+12
= 4x^2-20x+21
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