Question 11
(a) If f(ϰ) = and f(3) = 21, find f(x).
(b) The second, fourth and eight terms of an Arithmetic Progression (A.P.) form the first
three consecutive terms of a Geometric Progression (G.P.). The sum of the third and
firth terms of the A.P. is 20. Find the
(i) first four terms of the A.P.;
(ii) sum of the first ten terms of the A.P.
Observation