If (begin{vmatrix}-x & 12 \-1 & 4 end{vmatrix} = – 12), find x.

If (begin{vmatrix}-x & 12 \-1 & 4 end{vmatrix} = – 12), find x.

  • A.
    -6
  • B.
    -2
  • C.
    3
  • D.
    6
Correct Answer: Option D
Explanation

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