x^2-11x+10 = (x-1)(x-10)
x^2-2x-63 = (x+7)(x-9)
2x^2 -13x +6 = 2 (x-1/2)(x-6)
3x^2-21x-24 = 3 (x-8)(x+1)
4x^2-6x-4 = 4(x-2)(x+1/2)
y= -(x+1)^2 + 2
D(y) = R или х ∈ (-∞;+∞)