Binomial Expansion | OCR A-Level Maths | 40 Worked Examples (H240)

Forty fully worked binomial expansion questions for OCR A-Level Mathematics A (H240), written to the exact style of the H240 papers and graded Easy to Challenging. Every solution is broken down one atomic step at a time, with a plain-English note on every line and OCR mark-scheme annotations (M/A/B marks) on the lines the real scheme rewards. Coverage spans the whole of spec point 1.04: binomial coefficients and Pascal’s triangle, expansions of (a+bx)^n for positive integer n, finding a particular term or coefficient, the ‘hence’ trinomial twist, and the full Stage 2 rational-index work, expanding (a+bx)^n for any rational n using the factor-out-a method, stating the range of validity, combining with a second factor or a partial-fraction split, and using a truncated series for approximation. Answer conventions follow OCR exactly (exact form kept, otherwise 3 s.f.), and validity is always taken as the tighter window of the factors. Ideal for revision, homework or targeted 1-1 practice. Answers included.