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(1) 8x² - 26xy + 15y²
8 x (- 15) = - 120 ⇒ - 20 + (- 6) = - 26
= 8x² - 20xy - 6xy + 15y²
= 4x(2x - 5y) - 3y(2x - 5y)
= (4x - 3y)(2x - 5y)
(2) 24a² + 2ab - 15b²
24 x (- 15) = - 360 ⇒ 20 + (- 18) = 2
= 24a² + 20ab - 18ab - 15b²
= 4a(6a + 5b) - 3b(6a + 5b)
= (4a - 3b)(6a + 5b)
(3) 6a² + 7a - 20
6 x (- 20) = - 120 ⇒ 15 + (- 8) = 7
= 6a² + 15a - 8a - 20
= 3a(2a + 5) - 4(2a + 5)
= (3a - 4)(2a + 5)
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