Question

find the determinant of
[2 4]
[1 9]
14
-14
1
-1

Answer 1

First, multiply downward along the diagonal from upper left corner to lower right corner.
Next, multiply upward along the diag. from lower left corner to upper rt. corner, giving this result a - sign.

Combine your two results.

Answer 2

Give me an example of how to set it up because i'm confused sorry @mathmale

Answer 3

similar example