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Post-UTME Mathematics 2008 Objective — Question 3

Question 3 of 16 from the Post-UTME Screening (Post-UTME) Mathematics 2008 Objective paper, with the correct answer and a full explanation.

Find the value of k if |-2 1 1; 2 1 k; 1 3 -1| = 23

A. 1
B. 2Correct
C. 3
D. 4

Explanation

Expanding the determinant gives 9+7k=23, so k=2.

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