Mathematics

If (begin{vmatrix} x & 3 \ 2 & 7 end{vmatrix} = 15), find the value…

If (begin{vmatrix} x & 3 \ 2 & 7 end{vmatrix} = 15), find the value of x

  • A.
    3
  • B.
    4
  • C.
    5
  • D.
    2
Correct Answer: Option A
Explanation

(begin{vmatrix} x & 3 \ 2 & 7 end{vmatrix} = 15)x x 7 – 2 x 3 = 15
7x – 6 = 15
7x = 15+6
7x = 21x = 21/7x = 3