Hi I need help on these questions!

Let 2 4 A: 2 0 1 1 (a) (9 points) Factor A in the form I | 11 a2 [\"3 :3] I I where 111 and g are orthonormal. You must show the computations that lead to this factorization. (b) (6 points) What is the matrix of the orthogonal projection of 13.3 onto the image of A (give an actual 3 X 3 matrix)? If you have not done the rst part, you may receive 4 points by correctly expressing your answer in terms of {1 and g