Matrices and Determinants - Jamb Mathematics Past Questions and Answers

Question 6:

• 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

Question 7:

• JAMB 2019

If \(\begin{vmatrix} 2 & -5 & 3 \\ x & 1 & 4 \\ 0 & 3 & 2 \end{vmatrix} = 132\) find the value of x.

A. 5
B. 8
C. 6
D. 3

Question 8:

• JAMB 2014

Find y, if \(\begin{pmatrix}5 & -6 \\2 & -7\end{pmatrix}\begin{pmatrix}x \\ y \end{pmatrix} = \begin{pmatrix}7 \\-11\end{pmatrix}\)

A. 8
B. 5
C. 3
D. 2

Question 9:

• JAMB 2014

If \(\begin{vmatrix}-x & 12 \\-1 & 4 \end{vmatrix} = - 12\), find x.

A. -6
B. -2
C. 3
D. 6

Question 10:

• JAMB 2014

Find the value of \(\begin{vmatrix}0 & 3 & 2 \\1 & 7 & 8 \\0 & 5 & 4\end{vmatrix}\).

A. 12
B. 10
C. -1
D. -2