Jambmaths question:
If $\left| \begin{matrix} x & 3 \\ 2 & 7 \\\end{matrix} \right|=15$find the value of x
Jamb Maths Solution:
$\begin{align} & \left| \begin{matrix} x & 3 \\ 2 & 7 \\\end{matrix} \right|=15 \\ & 7x-6=15 \\ & 7x=21 \\ & x=3 \\\end{align}$
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