ECZ 2018 · GCE Paper 2 · Question 1 — Matrices
Question from ECZ 2018 · GCE Paper 2 · Question 1
(a) Given that matrix A = 2x23x,
(a(i)) find the positive value of x for which the determinant of A is 12,[2]
Verified working — step 1
A = 2x23x.(a(ii)) hence or otherwise, write A-1.[2]
Verified working — step 1
With x = 3, A = 6233 and det A = 12.(b) Solve the equation x2 - 4x - 2 = 0, giving your answers correct to 2 decimal places.[5]
Verified working — step 1
a = 1, b = -4, c = -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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