Hii. I just found your blog and thanks god, because I was trying to solve this one without luck. It says find the determinant of square matrix A. Thank you so much if you could help

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Heya!

The determinant is invariant under row addition, so if you add row i to row j k times then the determinant doesn’t change.

Knowing that, add row 1 to row 3 4 times and you get that row 3 is full of zeros. This means the determinant is 0.

Hope this helps! @colour-mind