ECZ 2016 · GCE Paper 1 — Matrices
If A = [1 −2; −1 4] (rows separated by semicolons) and C = [−1; 3] (a column vector), calculate AC.
- A. [5; −11]
- B. [7; −13]
- C. [−7; 13]
- D. [−5; 13]
Verified working — step 1
Top: (1)(−1) + (−2)(3) = −1 − 6 = −7. Bottom: (−1)(−1) + (4)(3) = 1 + 12 = 13. So AC = …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.
Have a different question?
Search it — if it is from a past paper or a school mock, chances are we have it worked out, or one that uses the same method.
Search any past-paper question