The correct solution is {{0 0 2},{2 0 0},{0 -2 0}}. Thanks to Joe Stujenske (corrected 3/3/2008 10:30 PM) In the solution to problem 7c), LaTeX typo: v_2- v-1 should have been v_2-v_1. Thanks to Jessica Villegas (corrected 3/3/2008, 11:00 PM). In the solution to practice exam 2, TF 17, an