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JAMB Mathematics 2017 Objective — Question 28

Question 28 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2017 Objective paper, with the correct answer and a full explanation.

If Q=[3 -1 1; -2 1 -1; 1 -3 2], find -3Q.

A. A. [-9 3 -3; 6 -3 3; -3 9 -6]Correct
B. B. [9 -6 3; -6 3 3; 3 -9 -6]
C. C. [-9 6 3; 3 -9 -6; 9 -6 3]
D. D. [-6 3 -3; -3 9 -6]

Explanation

Multiply every entry of Q by -3.

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