If Q is( left[ begin{array}{cc}
9 & -2 \
-7 & 4 \
end{array} right]) , then |Q| is
9 & -2 \
-7 & 4 \
end{array} right]) , then |Q| is
- A.
-50 - B.
-22 - C.
22 - D.
50
Correct Answer: Option C
Explanation
Q = ( left[ begin{array}{ccc}
9 & -2 \
-7 & 4 \
end{array} right])
|Q| = 9×4 – (-2×7)
= 36 – 14
= 22