a. What is the inverse of the matrix A = 7 0 0 9 ? b.

Question:

a. What is the inverse of the matrix A =

7 0 0 9

b. Guess the inverse of the matrix B =







7 0 0 0 9 0 0 0 11







Check to see whether or not your guess is correct by calculating BB−1 and B

−1B.

c. How would you generalise this to any matrix with terms only on the diagonal?

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