## Intermediate Algebra (6th Edition)

A 2x2 determinant can be calculated as $ad-bc$, where a is the upper-left entry, b is the upper-right entry, c is the lower-left entry, and d is the lower-right entry. Since the entry b is 0, the term bc will be 0. Therefore, the value of the determinant will be $ad=6\times2=12$