If \(\begin{vmatrix} x & 3 \\ 2 & 7 \end{vmatrix} = 15\), find the value of x
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
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
\(\begin{vmatrix} x & 3 \\ 2 & 7 \end{vmatrix} = 15\)x x 7 - 2 x 3 = 15
7x - 6 = 15
7x = 15+6
7x = 21x = 21/7x = 3