Question on: JAMB Mathematics - 2012
If (\begin{vmatrix} 5 & 3 \ x & 2 \end{vmatrix}) = (\begin{vmatrix} 3 & 5 \ 4 & 5 \end{vmatrix}), find the value of x
A
3
B
4
C
5
D
7
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Correct Option: C
(\begin{vmatrix} 5 & 3 \ x & 2 \end{vmatrix}) = (\begin{vmatrix} 3 & 5 \ 4 & 5 \end{vmatrix})
10 - 3x = 15 - 20
-3x = 15 - 20 - 10
-3x = -15
x = 5
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