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Algebra II Recipe: Identity and Inverse Matrices
A. Definitions
  1. identity matrix - a matrix having 1's on the main diagonal and zeros in all other entries.
  2. inverse matrices - two matrices whose product in any order is an identity matrix
B. How to Determine if Two Matrices are Inverses
  1. Multiply the two matrices: AB and BA.
  2. If the result is an identity matrix, then the matrices are inverses.
Are A and B inverses?

Are C and D inverses?

G Redden

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