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QUESTION
Using the Laplace expansion process, determine the non-singularity or otherwise of the matrix:
Using the Laplace expansion process, determine the non-singularity or otherwise of the matrix:
A= 15 7 9
2 5 6
9 0 12
If non- singular, find the inverse of this matrix and test the validity of your inverse by performing the matrix operation: A-1A = I
