Question

$\left|\begin{array}{cc}x& 2\\ 5& 6\end{array}\right|=14$
Find the value of x?

• A. 10
• B. 2
• C. 0.0
• D. 4

Answer 1

The correct option is D 4

$\left|\begin{array}{cc}x& 2\\ 5& 6\end{array}\right|=14$

$\Rightarrow 6\times x-10=14$
$\Rightarrow 6x-10=14$
$\Rightarrow 6x=10+14$
$\Rightarrow 6x=24$
$\Rightarrow x=\frac{24}{6}$
$\Rightarrow x=4$