Suppose A in an m x n matrix with linearly independent

Last updated: 7/4/2022

Suppose A in an m x n matrix with linearly independent columns and QR factorization A = QR. Show how the formula for the least-squares solution of Ax=b (given by Theorem 6.14) can be written using the QR factorization of A. Briefly explain the advantages of the formula you give over the formula given in Theorem 6.14.