Given that the first three terms, in ascending powers of xxx, of the binomial expansion of
19+x \frac{1}{\sqrt{9 + x}} 9+x1are
13−154x+1648x2 \frac{1}{3} - \frac{1}{54}x + \frac{1}{648}x^2 31−541x+6481x2, hence find first three terms, in ascending powers of xxx, of the binomial expansion of
19−x2 \frac{1}{\sqrt{9 - x^2}} 9−x21408 exam-style questions on Edexcel A Level Maths Binomial Expansion, covering 4.1 Expanding (1 + x)^n, 4.2 Expanding (a + bx)^n, and 4.3 Using Partial Fractions. Each one has a worked solution and a mark scheme showing where the marks go.