ECZ 2014 · O-Level Paper 1 — Algebra
Given that a = d − bcd − 1, make d the subject of the formula.
- A. d = a − bac − 1
- B. d = a + bac − 1
- C. d = b − aac − 1
- D. d = a − bac + 1
Verified working — step 1
Multiply out: a(cd − 1) = d − b, so acd − a = d − b. Collect the d terms: acd − d = a − b, so d(ac − 1) = a − b and d = …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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