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Question

Find the inverse of the matrix A=842294128.

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Solution

842294128

=842|100294|010128|001

R2R214R1,R3R318R1

=⎢ ⎢ ⎢ ⎢ ⎢842|1000872|1410032314|1801⎥ ⎥ ⎥ ⎥ ⎥

R3R3316R2

=⎢ ⎢ ⎢ ⎢ ⎢842|1000872|14100022732|5643161⎥ ⎥ ⎥ ⎥ ⎥

R332227R3,R2R272R3,R1R12R3

=⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢840|2322271222764227080|48227248227112227001|5454622732227⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥

R218R2,R1R14R2

=⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢800|2562271122278227010|62273122714227001|5454622732227⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥

R118R1

=⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢100|32227142271227010|62273122714227001|5454622732227⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥

=⎜ ⎜ ⎜ ⎜ ⎜ ⎜ ⎜32227142271227622731227142275454622732227⎟ ⎟ ⎟ ⎟ ⎟ ⎟ ⎟


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