ECZ 2016 · O-Level Paper 2 · Question 1 — Matrices
Question from ECZ 2016 · O-Level Paper 2 · Question 1
(a) Given that matrix Q = 3-2x4, find the
(a(i)) value of x, given that the determinant of Q is 2,[2]
Verified working — step 1
Q = 3-2x4.(a(ii)) inverse of Q.[2]
Verified working — step 1
With x = -5, Q = 3-2-54 and det Q = 2.(b) Solve the equation x2 + 2x = 7, giving your answers correct to 2 decimal places.[5]
Verified working — step 1
Rearrange to standard form: x2 + 2x - 7 = 0, so a = 1, b = 2, c = -7.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