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If \(N = \begin{pmatrix} 3 & 5 & -4 \\ 6 & -3 & -5...

Mathematics
JAMB 2018

If \(N = \begin{pmatrix} 3 & 5 & -4 \\ 6 & -3 & -5 \\ -2 & 2 & 1 \end{pmatrix}\), find \(|N|\).

  • A. 65
  • B. 23
  • C. 17
  • D. 91
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Correct Answer: Option C
Explanation

\(\begin{vmatrix} 3 & 5 & -4 \\ 6 & -3 & -5 \\ -2 & 2 & 1 \end{vmatrix}\)

= \(3(-3 - (-10)) - 5(6 - 10) + (-4)(12 - 6)\)

= \(21 + 20 - 24\)

= 17

There is an explanation video available below.


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Explanation Video

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NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Join your school's WhatsApp group
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789