Question

разложите на множители x^2-2y^2-xy-y-x

Answer 1

x² - 2y² - xy - y - x = x² - xy - x - y - 2y² = x² - y² - xy - y² - x - y =
(x - y)(x + y) - y(x + y) - (x + y) = (x + y)(x - y - y - 1) = (x + y)(x - 2y - 1)