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3x (2x³ - 4x)
6x⁴ - 12x²
2.
(3x + 2)(2x - 3)
(3x . 2x)+(3x . (-3))+(2 . 2x)+(2 . -3)
6x² + (-9x) + 4x + (-6)
6x² - 5x - 6
3.
(2x+3)²
(2x+3)(2x+3)
(2x . 2x)+(2x . 3)+(3 . 2x)+(3 . 3)
4x² + 6x + 6x + 9
4x² + 12x + 9