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6x³ + 4x + 2 - 2x - 1 =
6x³+ 4x - 2x + 2 -1 = 6x³ + 2x -1
2. 2(3x³2x + 1) x (2x -1) =
4x² - 2x + 2x - 1 = 4x² - 1
Maaf kalo salah, yang nomor tiga saya ga ngerti hehe:)