practice test mat 242 p2

3 20 points| Find the inverse of the matrix Solution: Typical row operations are shown below. 3 1 0 The inverse is thus 3 -1}1 0 -2 10 1 -2 1o 0 0 1-1 1-3 4 2-6 9 1 -2 0 1 0o o 1 -2 -1 3 0 0 1 -2 -1 3 0o o 1 -2 -1 3 -2 6 -2 0 3 -5 -6 9 7 -2 1 -3 2 -6 0 1 1 -3 2 -6 1 1 | using Gauss-Jordan Elimination 1 Grading: +5 points for the set-up. +10 points for the row operations, +5 points for indicat- ing the answer. Grading for common mistakes: —7 points for bad row operations; —5 points for only doing Ganssian Elimination; +10 points (total) for using another method correctly; +5 points (total) for using another method incorrectly.