If begin vmatrix x amp 3 2 amp 7 end vmatrix 15... - JAMB Mathematics 2010 Question
If \(\begin{vmatrix} x & 3 \ 2 & 7 \end{vmatrix}\) = 15, find the value of x
A
4
B
5
C
2
D
3
correct option: d
If (\begin{vmatrix} x & 3 \ 2 & 7 \end{vmatrix}) = 15
7x - 2 x 3 = 15
7x - 6 = 15
7x = 15 + 6 = 21
therefore x = (\frac{21}{7})
= 3
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