а) x^2 + 2x - 15 = (x + 5)(x - 3)
б) 3x^2 + 4x - 7 = (3x - 1)(x + 7)
в) x^2 + 7x - 18 = (x + 9)(x - 2)
г) 2у^2 - 7у - 9 = (2у + 1)(у - 9)
а) x^2 + 2x - 15 = (x + 5)(x - 3)
б) 3x^2 + 4x - 7 = (3x - 1)(x + 7)
в) x^2 + 7x - 18 = (x + 9)(x - 2)
г) 2у^2 - 7у - 9 = (2у + 1)(у - 9)