Evaluate begin vmatrix 4 amp 2 amp -1 2 amp 3 a... - JAMB Mathematics 2011 Question
Evaluate (\begin{vmatrix} 4 & 2 & -1 \ 2 & 3 & -1 \ -1 & 1 & 3 \end{vmatrix})
A
25
B
45
C
15
D
55
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Correct Option: A
(\begin{vmatrix} 4 & 2 & -1 \ 2 & 3 & -1 \ -1 & 1 & 3 \end{vmatrix})
4 (\begin{vmatrix} 3 & -1 \ 1 & 3 \end{vmatrix}) -2 (\begin{vmatrix} 2 & -1 \ -1 & 3\end{vmatrix}) -1 (\begin{vmatrix} 2 & 3 \ -1 & 1 \end{vmatrix})
4[(3 x 3) - (-1 x 1)] -2 [(2x 3) - (-1 x -1)] -1 [(2 x 1) - (-1 x 3)]
= 4[9 + 1] -2 [6 - 1] -1 [2 + 3]
= 4(10) - 2(5) - 1(5)
= 40 - 10 - 5
= 25
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