Its old exam im working with the problem is solve diffrent so the picture nr 1 at begining is the problem and rest is how u solve it but on third step (the step before last) acording to me it should be wrong:S they wanna get same in the bottom so u multiplicerar with x+1 and x+3 so acording to me it should be (x+1)^2(x+3)^2 can some1 plz explain?