Suppose the matrices a, b, and c are square, but not necessarily of the same size. the n x n matrix ? 1) () 0 0 c solve such applications. is an example of a block diagonal matrix. bloc that make them useful both in applications in the sciences and in writing software that people (a) (4 points) assuming that d is invertible, find a formula for d-1 (in terms of a, b, and c, of course) and convince me that you have the right formula. (you're going to have to make one or more assumptions about a, b, and c. that's ok.) b) (1 point) in the previous part of this item, what assumption(s) did you make about a, b, and c?