For 6, I have no idea how you got the denominator y + 1 + y^2. The common denominator would be y^2 + y. Notice that (y+1) * y = y^2 + y. You should be able to simplify with that info in mind. Just make sure that before you start simplifying, you take the separate denominators and set them equal to zero so you know what values of y are impossible.
For 7, the factorization of 2x^2 + 9x -5 is (2x - 1)(x + 5). You should be able to finish the simplification with that info.