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Question:

If $\left[\begin{array}{ll}x & 2\end{array}\right]\left[\begin{array}{l}3 \\ 4\end{array}\right]=2$, find $x$

Solution:

Given : $\left[\begin{array}{ll}x & 2\end{array}\right]\left[\begin{array}{l}3 \\ 4\end{array}\right]=2$

$\Rightarrow 3 x+8=2$

$\Rightarrow 3 x=2-8$

$\Rightarrow 3 x=-6$

$\Rightarrow x=\frac{-6}{3}$

$\Rightarrow x=-2$

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