Compute the LU factorization of the matrix

A=

[2 1 1]

[4 1 0]

[-2 2 1]

and solve A[ = ][8 11 3

using back substitution.

Let A=

[1 1 1]

[1 1 2]

[1 2 5]

Find a permutation matrix so that PA has an LU factoriza-

tion. Compute L and U.

this is should be an easy question, but it's been so long since i ve done matrix, so any help will be appreaciated..