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a.) (2x.x + 2x.(-4) + 3.x + 3.(-4)) = 2x² - 8x + 3x - 12 = 2x² - 5x - 12
b.) (a.a + a.(-5b) + 3b.a + 3b.(-5b)) = a² - 5ab + 3ab - 15b² = a² - 2ab - 15b²
Note: 3ba dan 3ab sama saja, karena sifat perkalian a.b = b.a
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