Question 226376
use the diagonal method, repeat the first two columns to the right of the matrix:

(2 -1  3)2  -1
(1  4  4)1  4
(1  0  2)1  0

then multiply numbers diagonally starting from the top left:
2.4.2-1.4.1+3.1.0
then - (multiply numbers diagonally starting from the bottom left)
1.4.3-0.4.2-2.1.(-1)

add these answers, you get the determinant value:
2.4.2-1.4.1+3.1.0 = 16-4+0=12
1.4.3-0.4.2-2.1.(-1)=12-0+2=14

add: 12+14=26
done