If [ cc x & 2 18 & x ]= [ cc 6 & 2 18 & 6 ] then x is equal to : - Vidyadip

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 $x$ is equal to :

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Answer

(B)$\pm 6$
$x^2-36=36-36 \Rightarrow x^2-36=0$
or $x^2=36 \Rightarrow x=\sqrt{36}= \pm 6$

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