(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I was using the method shown in the following video;

to find the determinant for the following 4x4 matrix

1 -2 3 -4

5 6 -7 8

-9 -10 11 -12

-13 14 -15 16

3. The attempt at a solution

I was therefore expanding this out by using the first three columns set to the right of this matrix.

Is this the correct thing to do if using this method?

I get an answer of -3264

Though when I use this online determinant calculator

http://www.bluebit.gr/matrix-calculator/

it provides an answer of 0

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# Determinant of 4x4 matrix

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