Jambmaths question:
If $\left| \begin{matrix} 2 & 3 \\ 5 & 3x \\\end{matrix} \right|=\left| \begin{matrix} 4 & 1 \\ 3 & 2x \\\end{matrix} \right|$ find the value of x
Option A:
-12
Option B:
-6
Option C:
12
Option D:
6
Jamb Maths Solution:
$\begin{align} & \left| \begin{matrix} 2 & 3 \\ 5 & 3x \\\end{matrix} \right|=\left| \begin{matrix} 4 & 1 \\ 3 & 2x \\\end{matrix} \right| \\ & 6x-15=8x-3 \\ & 8x-6x=-15+3 \\ & 2x=-12 \\ & x=-6 \\\end{align}$
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