If Q is\( \left[ \begin{array}{cc}
9 & -2 \\
-7 & 4 \\
\end{array} \right]\) , then |Q| is?
A
-50
B
-22
C
22
D
50
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
Q = \( \left[ \begin{array}{ccc}
9 & -2 \\
-7 & 4 \\
\end{array} \right]\)
|Q| = 9x4 - (-2 x -7)
= 36 - 14
= 22
Source: Myschool Past Questions Archive (Record #9324)