ECZ 2014 · O-Level Paper 1 — Quadratic Functions
Given that y = 2x² − 1, find the value of y when x = −5.
- A. −51
- B. 49
- C. 51
- D. 99
Verified working — step 1
y = 2 × (−5)² − 1 = 2 × 25 − 1 = 50 − 1 = …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