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2 . (3x-4)²
= 2 . (3x-4)(3x-4)
= 2 . 9x² -12 x - 12x + 16
= 2 (9x² - 24x + 16)
= 18x² - 96x + 32
5)
(2x+12)(x-5) = 2x² - 10x + 12x - 60 = 2x² + 2x - 60
5.