Mathematics

If Q is( left[ begin{array}{cc} 9 & -2 \ -7 & 4 \ end{array} right])…

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
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