# How do you factor completely x^2 - 10xy - 25y^2?

Apr 15, 2016

Not factorable.

#### Explanation:

Consider x as variable and y as constant. Factor the quadratic function:
(x) = x^2 - 10xy - 25y^2
D = b^2 - 4ac = 100y^2 + 100y^2 = 200y^2.
Since D isn't a perfect square, this trinomial can't be factored