Mathematics A-Level
rational expressions
What rational expressions means in Mathematics A-Level, as defined for WJEC.
Definition of rational expressions
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Read the wording for your board, then hide it and explain rational expressions in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: WJEC
Expressions of the form f(x)/g(x) that are simplified by factorising the numerator and denominator into linear or irreducible quadratic factors and cancelling common factors.
Topics that use rational expressions
- Algebra and Functions (A2 Unit 3: Pure Mathematics B) (WJEC A-Level)
Related terms
- algebraic division
- cancelling factors
- domain restrictions
- equating coefficients
- extraneous solutions
- function modelling
- horizontal and vertical scaling
- improper fractions
Using rational expressions in the exam
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