Question 25

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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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