Edexcel GCSE (9–1) Mathematics Higher, Chapter 17 · exam-style questions with mark schemes · rearranging formulae with the subject on both sides, adding, subtracting, multiplying and dividing algebraic fractions, simplifying by factorising, algebraic proof, rationalising surds and surds in algebra, solving equations with algebraic fractions, composite functions fg(x) and inverse functions f−1(x)