Jambmaths question:
If $\left| \begin{matrix} -x & 12 \\ -1 & 4 \\\end{matrix} \right|=-12$, find x
Option A:
3
Option B:
6
Option C:
–6
Option D:
–2
Jamb Maths Solution:
$\begin{align} & \left| \begin{matrix} -x & 12 \\ -1 & 4 \\\end{matrix} \right|=-12 \\ & 4x+12=-12 \\ & 4x=-24 \\ & x=-6 \\\end{align}$
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