What am I doing wrong, to get a upper triangle matrix. its going to take some time drawing it out. Give me some time.

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What am I doing wrong, to get a upper triangle matrix. its going to take some time drawing it out. Give me some time.

Mathematics
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  • phi
to make the row reduction easier, you could multiply the last row of A by 3 this will change its determinant by a factor of 3, so set k=1/3 to compensate once you have A in the form of an upper triangular matrix, you can find its determinant by multiplying the entries on its diagonal. then multiply by 1/3 to get the determinant of the original A matrix

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