ECZ 2019 · GCE Paper 1 — Quadratic Functions
A function y = (1 + x)(x − 2). Which description matches the sketch of its graph?
- A. mathquadratic_functionsq732a.png
- B. mathquadratic_functionsq732b.png
- C. mathquadratic_functionsq732c.png
- D. mathquadratic_functionsq732d.png
Verified working — step 1
y = 0 when 1 + x = 0 (x = −1) or x − 2 = 0 (x = 2), so the graph cuts the x-axis at −1 and 2. Expanding gives y = x² − x − 2: the positive x² means it opens upwards, and setting x = …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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