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= 2x² - 8x + 3x - 12
= 2x² - 5x - 12
b) . (a + 3b) (a - 5b)
= a² - 5ab + 3ab - 15b²
= a² - 2ab - 15b²
c). (5m - 1) (2m + 4)
= 10m² + 20m - 2m - 4
= 10m² + 18m - 4
maaf kalau salah