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6X² + 15X - 8X - 20
3X(2X + 5) -4(2X + 5)
(3X - 4)(2X + 5)
Dengan menjabarkan ulang:
(6x+a)(6x+b)
= 36x² + 6(a+b)x + ab
Maka,
Maka,
6(a+b) = 42
a+b = 7
Dan,
ab = 120
Maka, diambil:
a = 15
b = -8
Sehingga,
Faktorannya: