ECZ 2020 · O-Level Paper 1 — Matrices
Given that M = -3-1420-2 and N = -21, find (b) MN as a single matrix.
- A. 7-10-2
- B. 5-62
- C. 5-6-2
- D. MN is not possible
Verified working — step 1
MN = (-3×-2 + -1×1; 4×-2 + 2×1; 0×-2 + -2×1) = (6 - 1; -8 + 2; 0 - 2) = …The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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