18.06 - PS3 - Solved

Exercises on multiplication and inverse matrices 

Problem 3.1: Add AB to AC and compare with A(B + C) : 

                                                      A B C 

Problem 3.2: (2.5 #24. Introduction to Linear Algebra: Strang) Use GaussJordan elimination on [U I] to find the upper triangular U−1 : 

   

UU−1 = I  .