Locate roots of f(x) = 0 by considering changes of sign of f(x) in an interval of x on which f(x) is sufficiently well behaved; understand how change of sign methods can fail(Pearson Edexcel A-Level)

Mastery Mind: Mathematics Revision · Oct 20, 2026 · 5m

A sign-change argument is a compact proof that a root exists, not a guess from a calculator. Master B-S-C-C, and you can secure marks for locating roots, proving decimal-place accuracy and explaining exactly when numerical methods can mislead. Listen to this audio revision guide for Locate roots of f(x) = 0 by considering changes of sign of f(x) in an interval of x on which f(x) is sufficiently well behaved; understand how change of sign methods can fail. Test your knowledge with interactive exam questions and flashcards at https://masterymind.co.uk/study-guides/mathematics-pearson…