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bila dijabarkan menjadi = -3x2 + 21x - 3x + 21 = -3x2 + 18x + 21
= 3x(-x+7) + 3(-x+7)
= (3x+3)(-x+7)
jadi -3x²+18x+21 memiliki faktor (3x+3) dan (-x+7)