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3x² + 13x + 10 = (3x + 10)(x + 1)
3x² +10x +3x +10 (dicari faktor dari 3 dikali 10 yang hasil jumlahnya yaitu 13)
(3x² +10x) +(3x +10)
x(3x +10) +1(3x +10)
(x +1) (3x +10)