ECZ 2018 · GCE Paper 1 — Quadratic Functions
The diagram below shows a sketch of a graph which meets the x-axis at −4 and 2. Find the equation of the graph.
- A. y = x2 + 2x − 8
- B. y = x2 − 2x − 8
- C. y = −x2 − 2x + 8
- D. y = x2 + 2x + 8
Verified working — step 1
A root at x = r gives a factor (x - r) - the sign flips as it enters the bracket.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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