In this episode, I explain how I was able to answer parts a and b to exploration problem #22. The matrix I got for part a reads as follows (from left to right, row by row): 4, 12, -5, 19, 27, 32, 7, 18, 123. For part b, I was able to prove that the matrix provided was the identity matrix (for 3x3 matrices) by multiplying the identity matrix to matrix M, and finding the matrix (product) to be identical to matrix M.