Question 725391
this factors to:


(x-y)(x+y) divided by (x+2y)(x+y)


the (x+y) in the numerator and denominator cancel out and you are left with:


(x-y) divided by (x + 2y)


that's the simplified expression.


the restrictions come from the original equation.


the original equation is:


(x^2 - y^2) divided by (x^2 + 3xy + 2y^2) which factored out to be:


(x - y) * (x + y) divided by (x + y) * (x + 2y)


since the denominator can't be equal to 0, then the following restrictions apply.


x cannot be equal to -y, otherwise (x + y) will be equal to 0.


x cannot be equal to -2y, otherwise (x + 2y) will be equal to 0.