Question on: JAMB Mathematics - 2014
\(\text{If }\begin{vmatrix}
-x & 12 \\ -1 & 4
\end{vmatrix} = - 12, \text{ find x}\)
-x & 12 \\ -1 & 4
\end{vmatrix} = - 12, \text{ find x}\)
A
-6
B
-2
C
3
D
6
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Correct Option: D
\(\begin{vmatrix}
-x & 12 \\ -1 & 4
\end{vmatrix} = - 12\)
-4x - (-1)12 = -12
-4x + 12 = -12
-4x = -12 - 12
-4x = - 24
x = 6
-x & 12 \\ -1 & 4
\end{vmatrix} = - 12\)
-4x - (-1)12 = -12
-4x + 12 = -12
-4x = -12 - 12
-4x = - 24
x = 6
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