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Row reduce the augmented matrix [AI]. If A is row equivalent to I, then [AI] is row eq ...
Row reduce the augmented matrix [A?I?]. If A is row equivalent to I, then [A?I?] is row equivalent to [I?A?1?]. Otherwise, A does not have an inverse. Find the inverse of matrix A if it exists. A=??122?210?353?? Check that your answer is correct using AA?1=I.