?

Algebra

Free Version

Upgrade subject to access all content

Moderate

Solve for Elements in a Matrix

ALGEBR-S@YRKX

What is the value of $ab$ given the equation below?

$$\begin{vmatrix} 6&b\\\ a&-5\\\end{vmatrix}=-10$$

A

$-40$

B

$-20$

C

$20$

D

$-1$