Help on 5 urgently

Problem 5. (8 points) 3 =1 10 letA= {4 2| andb= | 5 {.The QR factorization of the matrix A is given by: 0 2 10 3 -4 3 1 g 4 \\f [5 1 } D 2 L 2v2 V2 (a) Applying the QR factorization to solving the least squares problem Ax = b gives the system: (use exact values 5 o] o 2= [T (b) Usecsubstitution to solve the system in part (a) and find the least squares solution