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If P = \(\begin{pmatrix} 1 & 0 & -1 \\ 3 & 4 & 5...

Mathematics
JAMB 2004

If P = \(\begin{pmatrix} 1 & 0 & -1 \\ 3 & 4 & 5 \\ -1 & 0 & 1 \end{pmatrix}\), then |P| is 

  • A. -8
  • B. 0
  • C. 4
  • D. 8
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Correct Answer: Option B
Explanation

The determinant of the matrix 

\(P = \begin{pmatrix} 1 & 0 & -1 \\ 3 & 4 & 5 \\ -1 & 0 & 1 \end{pmatrix}\)

is calculated as follows:

\(|P| = 1 \cdot (4 \cdot 1 - 5 \cdot 0) - 0 \cdot (3 \cdot 1 - 5 \cdot -1) + (-1) \cdot (3 \cdot 0 - 4 \cdot -1) = 4 - 0 - 4 = 0\)

Thus, the determinant of the matrix \( P \) is 

\(|P| = 0\).


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