Need help on 2 qstn,

6.5.1 Question Help Find a least-squares solution of Ax = b by (a) constructing the normal equations for x and (b) solving for x. 1 4 A= 2 -3 Lb= 2 3 26.5.6 Question Help Describe all least-squares solutions of the equation Ax = b. 0 1 10 1 6 A = 1 10 3 I, b= 101 8 1 10 0 The general least-squares solutions of Ax = b for the given matrix A and vector b are all vectors of the form X = + X3 , with x3 free. (Simplify your answers.)