Mathematics A-Level
sign change
What sign change means in Mathematics A-Level, as defined for WJEC.
Definition of sign change
Check what you remember
Read the wording for your board, then hide it and explain sign change in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: WJEC
A change of sign occurs when f(a) and f(b) have opposite signs, so that f(a) × f(b) < 0.
Topics that use sign change
- Numerical Methods (A2 Unit 3: Pure Mathematics B) (WJEC A-Level)
Related terms
- bounds for the true integral
- cobweb diagram
- contextual problem solving
- divergence
- failure of sign change
- fixed-point iteration
- Intermediate value theorem
- Newton-Raphson method
Using sign change in the exam
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