а) 1.5x^2 - 31.5x + 120 = 1.5(x^2 - 21x + 80) = 1.5(x - 5)(x - 16)б) x^2 + 5x + 20 = (x + 5)(x + 4)в) -x^2 + 15x - 102 = -(x^2 - 15x + 102) = -(x - 6)(x - 17)г) x^2 - 10x + 15 = (x - 5)(x - 3)д) -x^2 - 8x - 68 = -(x^2 + 8x + 68) = -(x + 10)(x + 6)
а) 1.5x^2 - 31.5x + 120 = 1.5(x^2 - 21x + 80) = 1.5(x - 5)(x - 16)
б) x^2 + 5x + 20 = (x + 5)(x + 4)
в) -x^2 + 15x - 102 = -(x^2 - 15x + 102) = -(x - 6)(x - 17)
г) x^2 - 10x + 15 = (x - 5)(x - 3)
д) -x^2 - 8x - 68 = -(x^2 + 8x + 68) = -(x + 10)(x + 6)