Question

If x/y +y/x=-1 , x not equal to 0 and y not equal to 0 ,find value of x^2-y^2

Answer 1

x/y + y/x = -1
x/y = -1 - y/x
x/y = (-x-y)/x
x^2 = (-x-y)/y

~ putting value of x^2 in question

x^2-y^2
(-x-y)/y - y^2
(-x-y-y^3)/y
or
-x/y -1 - y^2