Răspuns :
X^2-12x-y^2+36-2yz-z^2 =
x^2 - 12x + 36 - y^2 - 2xy - z^2 =
(x^2 - 12x + 36) - (y^2 + 2xy + z^2) =
(x - 6)^2 - (y + z)^2 =
(x - 6 - y - z) (x - 6 + y + z)
x^2 - 12x + 36 - y^2 - 2xy - z^2 =
(x^2 - 12x + 36) - (y^2 + 2xy + z^2) =
(x - 6)^2 - (y + z)^2 =
(x - 6 - y - z) (x - 6 + y + z)