1)(x^2-y^2):(x+y)^2 = ((x+y)(x-y))/(x+y)^2 = (x-y)/(x+y)
2)(x-y)^2:(x^2-y^2) = (x-y)*(x-y)/((x+y)(x-y)) = (x-y)/(x+y)
3)(x^2-9):(x^2+6x+9) = (x^2-3^2)/((x+3)^2) = (x-3)/(x+3)
4)(x^2-10x+25):(x^2-25) = (x-5)^2/((x-5)(x+5)) = (x-5)/(x+5)
1)
(x^2-y^2):(x+y)^2 = ((x+y)(x-y))/(x+y)^2 = (x-y)/(x+y)
2)
(x-y)^2:(x^2-y^2) = (x-y)*(x-y)/((x+y)(x-y)) = (x-y)/(x+y)
3)
(x^2-9):(x^2+6x+9) = (x^2-3^2)/((x+3)^2) = (x-3)/(x+3)
4)
(x^2-10x+25):(x^2-25) = (x-5)^2/((x-5)(x+5)) = (x-5)/(x+5)