ALGEBRA - Jamb Mathematics Past Questions and Answers

Question 21:

• 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 22:

• JAMB 2019

Given the matrix \(A = \begin{vmatrix} 3 & -2 \\ 1 & 6 \end{vmatrix}\). Find the inverse of matrix A.

A. \(\begin{vmatrix} 6 & 2 \\ 1 & 6 \end{vmatrix}\)
B. \(\begin{vmatrix} \frac{2}{11} & \frac{1}{12}\\ \frac{3}{20} & \frac{1}{10} \end{vmatrix}\)
C. \(\begin{vmatrix} -3 & 2 \\ -1 & -6 \end{vmatrix}\)
D. \(\begin{vmatrix} \frac{3}{10} & \frac{1}{10} \\ \frac{-1}{20} & \frac{3}{20}\end{vmatrix}\)

Question 23:

• 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 24:

• JAMB 2018

If P = [\(\frac{Q(R - T)}{15}\)] \(\frac{1}{3}\) make T the subject of the relation

A. T = \(\frac{R + P^3}{15Q}\)
B. T = \(\frac{R - 15P^3}{Q}\)
C. T = \(\frac{R - 15P^3}{Q}\)
D. T = \(\frac{15R - Q}{P^3}\)

Question 25:

• JAMB 2018

Use the quadratic equation curve to answer this questions
What is the minimum value of the graph?

A. -5.3
B. 0.5
C. 3
D. 8