Use the expansion (1+2x)−3=1−6x+24x2−80x3+⋯(1+2x)^{-3}=1-6x+24x^2-80x^3+\cdots(1+2x)−3=1−6x+24x2−80x3+⋯ to find the expansion of 3x+1(1+2x)3\displaystyle \frac{3x+1}{(1+2x)^3}(1+2x)33x+1 up to and including x3x^3x3
408 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.