. Problem 1. Solve the least square problem Ax ? b from problem H with matlab using three different ways: (a) Using the backslash operator (c) Using the qr command then the linsolve command with option "upper triangular" (b) Using ATA Write the 3 codes with pen and paper on your hwk so that your TA can grade them . Problem 1. Solve the least square problem Ax ? b from problem H with matlab using three different ways: (a) Using the backslash operator (c) Using the qr command then the linsolve command with option "upper triangular" (b) Using ATA Write the 3 codes with pen and paper on your hwk so that your TA can grade them