75ײ-3(x-y)² factorise the following term
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75ײ-3(x-y)²
= 75ײ- 3x^2 + 6xy - 3y²
= 72x^2 + 6xy - 3y^2
= 72x^2 + 18xy - 12xy - 3y^2
= 6x (12x + 3y) - y (12xy + 3y)
= (12x + 3y) (6x - y)
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