I need to find the determinant of the matrix
2 -1 3
1 4 -2
-1 0 1
by the 3rd row.
I ended up getting -1(2-12) - 1(8+1) = 10 - 9 = 1
Is this correct?
when i did expanded by the first row, i got 17.
2(4) -1(3) + 3(4) = 8 - 3 + 12 = 17.
Does it make a difference if you expand by a different row? because the problem says to expand by the 3rd row. When i did it again I ended up getting -1. I don't get it.