Mathematics A-Level
quadratic substitution
What quadratic substitution means in Mathematics A-Level, as defined for WJEC.
Definition of quadratic substitution
Check what you remember
Read the wording for your board, then hide it and explain quadratic substitution in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: WJEC
A temporary variable u = g(x) is substituted to reduce an equation to the form au² + bu + c = 0.
Topics that use quadratic substitution
- Algebra and Functions (AS Unit 1: Pure Mathematics A) (WJEC A-Level)
Related terms
- algebraic division
- Asymptotes
- boundary curves
- Completing the square
- conjunction
- critical values
- curve sketching
- dashed and solid lines
Using quadratic substitution in the exam
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