Mathematics 0580 · IGCSE · Sequences

Sequences — practice question

The first four terms in the sequence are 2.75, 6, 11.25, 20. Its $n$th term is given by $\frac{1}{4}n^3 + an^2 + bn$.

(main)[5]

Calculate the values of $a$ and $b$.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Equations set up correctly” …