Answer
28
Work Step by Step
The determinant of a 2x2 matrix is $ad-bc$. In this case that is
$8*2-4*(-3)$ or $16+12$ which equals $28$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.