a) x3 + 2x2 + x + 2 = (x3 + x) + (2x2 + 2) = x(x2 + 1) + 2(x2 + 1) = (x + 2)(x2 + 1)
б) 4x - 4y + xy - y2 = 4(x-y) + y(x-y) = (4+y)(x-y)
Ответ: