TMUA 2021 Paper 1 Q16 — Worked Solution

P1·Sequences & Series, Algebra & Surds·7.0Official · 2021 · Q16

binomial-expansionascending-descendingsimultaneous-equations

Consider the expansion of

(a + b x)^{n} .

The third term, in ascending powers of

x

, is

105 x^{2}

. The fourth term, in ascending powers of

x

, is

210 x^{3}

. The fourth term, in descending powers of

x

, is

210 x^{3}

.Find the value of

(\frac{a}{b})^{2}

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