If Q begin pmatrix 9 amp -2 -7 amp 4 end pmatri... - JAMB Mathematics 2009 Question
If Q = \(\begin{pmatrix} 9 & -2 \ -7 & 4 \end{pmatrix}\), then |Q| is
A
-50
B
-22
C
22
D
50
correct option: c
If Q = \(\begin{pmatrix} 9 & -2 \ -7 & 4 \end{pmatrix}\), then |Q| is
= 9 x 4 - (-2) x (-7)
= 36 - 14
= 22
= 9 x 4 - (-2) x (-7)
= 36 - 14
= 22
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