ECZ 2019 · O-Level Paper 2 · Question 2 — Sequences and Series
The geometric progression 4, 8, 16, ...
(a) Simplify 6x^2 - 24x - 2.[2]
Verified working — step 1
6x2 - 24 = 6(x2 - 4) = …(b(i)) Given the geometric progression 4, 8, 16, ..., find the geometric mean of 256 and 1 024.[2]
Verified working — step 1
The geometric mean of two numbers is the square root of their product.(b(ii)) Find the 11th term.[2]
Verified working — step 1
a = 4 and r = 84= …(b(iii)) Find the sum of the first 11 terms.[3]
Verified working — step 1
S_n = …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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