Finding the Determinant of a 4x4 Matrix on Calculator

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-What if the element is Zero?
If the element is 0, then you have to find another "P" that is not 0.
Apply the same pattern that this video teaches. Find another "P" in the same row.
In the video I chose column 4, thus row 1 since "5" is in row 1 and in column 4.
Thank you for watching.
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What if p=0 ? Can we do a change between line and another ?

amirmehalaene