Question

Fill in the blanks with correct number

$\left|\begin{array}{cc}3& 2\\ 4& 5\end{array}\right|=3\times \boxed{}–\boxed{}\times 4=\boxed{}–8=\boxed{}$

Answer 1

$\left|\begin{array}{cc}3& 2\\ 4& 5\end{array}\right|=3\left(5\right)-2\left(4\right)=15-8=7$
Thus, we have
$\left|\begin{array}{cc}3& 2\\ 4& 5\end{array}\right|=3\times \boxed{5}–\boxed{2}\times 4=\boxed{15}–8=\boxed{7}$