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x² - 3x + 4x - 12
x² + x - 12
(3y - 4)²
(3y - 4)(3y - 4)
9y² - 12y - 12y + 16
9y² - 24y + 16
(x^2-3x+4x-12)
(x^2+x-12)
2.(3y-4)(3y-4)
(9y^2-12y-12y+16)
(9y^2-24y+16)