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