Question

If $\left\arrowvert\begin{array}{ccc}x&2\\18&x\end{array}\right\arrowvert=\left\arrowvert\begin{array}{ccc}6&2\\18&6\end{array}\right\arrowvert$, then x is equal to
(A) 6
(B) ± 6
(C) - 6
(D) 0

Answer 1

Answer : x=6

Step-by-step explanation:

When two matrices are equal, their corresponding elements are equal.

See in Left matrix, where no. 18 is there; in same position no.18 is there in Right matrix.

Same for no.2 & 6. So, x= 6

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