and . Homework Help ✎
Find values for a, b, c, and d so that MN = I.
Use the results of (b) to find M−1.
Using the lower left entry from part (a) and matrix I:
−1(a) + 2(c) = 0
Now repeat this process for the rest of the entries.
Look at part (b) and remember that M(M−1) = I.