begin vmatrix -2 amp 1 amp 1 2 amp 1 amp k 1 am... - JAMB Mathematics 1995 Question
\(\begin{vmatrix} -2 & 1 & 1 \ 2 & 1 & k \1 & 3 & -1 \end{vmatrix}\) = 23
A
1
B
2
C
3
D
4
correct option: b
-2(-1 - 3k) - 1(-2 -k) + 1(6 - 1) = 23
7k = 14
k = 2
7k = 14
k = 2
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