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12-9.
  1. Let and . Homework Help ✎

    1. Find MN.

    2. Find values for a, b, c, and d so that MN = I.

    3. 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.