Correct Answer: Option D

Explanation

\(\begin{vmatrix}-x & 12 \\-1 & 4\end{vmatrix} = - 12\)

-4x - (-1)12 = -12

-4x + 12 = -12

-4x = -12 - 12

-4x = - 24

x = 6

There is an explanation video available below.

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