Cheatsheet · Grade 10-11 · 1 pages · PDF
The Quadratic FormulaCheatsheet
The whole topic on a page or two, for the night before.
A concise 15-page IGCSE guide to the quadratic formula. It starts with writing equations in standard form and identifying a, b and c correctly, then shows how the formula is derived by completing the square. It then teaches how to use the formula step by step, giving answers as decimals or as exact surds. It also covers the discriminant: what it tells you about the number of roots, how it links to the graph, and how to find unknown coefficients. It finishes with guidance on choosing between factorisation, completing the square and the formula. Every method comes with worked examples and common mistakes to avoid. It ends with a summary checklist and exam tips.
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