ECZ 2015 · O-Level Paper 2 · Question 2 — Quadratic Equations
Question from ECZ 2015 · O-Level Paper 2 · Question 2
(a) Solve the equation 2y2 + 6y - 1 = 0, giving your answers correct to 2 decimal places.[5]
Verified working — step 1
a = 2, b = 6, c = -1.(b) Given that matrix Q = a23-2,
(b(i)) write an expression in terms of a for the determinant of Q,[1]
Verified working — step 1
Q = a23-2.(b(ii)) find the value of a, given that the determinant of Q is 2,[2]
Verified working — step 1
Set the determinant equal to 2.(b(iii)) write Q-1.[1]
Verified working — step 1
With a = -4, Q = -423-2 and det Q = 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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