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Checking Basic Concepts
Sections 9.5 and 9.6

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1. Find the inverse of the matrix A by hand. Use technology to check your answer.

2. Write the following system of linear equations as a matrix equation AX = B. Use technology to solve the system utilizing

3. Find the determinant of the matrix A using the method of cofactors. Use technology to check your answer. Is A invertible?



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