Question

If $\left[\begin{array}{cc}x& 2\\ 18& x\end{array}\right]=\left[\begin{array}{cc}6& 2\\ 18& 6\end{array}\right]$, then x =

• A. $\pm 6$
• B. $6$
• C. $-5$
• D. $7$

Answer 1

The correct option is B $6$

Both the matrices are $2\times 2$ and are equal i.e., corresponding elements are also equal

$\Rightarrow x=6$

$\therefore x=6$