keejitshen wrote:I can't solve this..
If the problem says "solve" then they need to give you the other part of the equation. If they only gave you an expression, maybe they said "simplify".
keejitshen wrote:(X^2 - Y^2 ) / (X^2 - XY - 2XY^2)
The x^2-y^2 is a difference of squares
so you can use the formula for that. The x^2-xy-2xy^2 has a common factor
you can take out front to get x(x - y - 2y^2). I don't think there's anything more you can do with it.