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= (x - 5)(x + 3)
[2]. 3x² - x - 10
Kalikan 3 dengan - 10, hasilnya - 30 dengan faktor-faktor 5 dan - 6
= 3x² - 6x + 5x - 10
= 3x(x - 2) + 5(x - 2)
= (3x + 5)(x - 2)