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10. The formula used to find inverse of a matrix A is---------
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Assuming that we have a square matrix A, which is non-singular (i.e. det (A) does not equal zero), then there exists an n × n matrix A-1 which is called the inverse of A such that: AA-1 = A-1A = I, where I is the identity matrix.
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Conclusion. To find the inverse of a 2x2 matrix: swap the positions of a and d, put negatives in front of b and c, and divide everything by the determinant (ad-bc).
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