If Q is left begin array cc 9 amp -2 -7 amp 4 e... - JAMB Mathematics 2009 Question
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 option: c
Q = \( \left[ \begin{array}{ccc}
9 & -2 \\ -7 & 4 \\ \end{array} \right]\)
|Q| = 9x4 - (-2x7)
= 36 - 14
= 22
9 & -2 \\ -7 & 4 \\ \end{array} \right]\)
|Q| = 9x4 - (-2x7)
= 36 - 14
= 22
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