Quadratic Formula — Year 11 GCSE Maths Worked Examples | IGCSE Exam Questions & Revision

You can tell how many solutions a quadratic has before you solve it. It takes about four seconds, and most students meet it far too late. This is Week 2 of the Year 11 Autumn course: using the quadratic formula without sign errors, surd-form and 2 d.p. answers, the discriminant and its three cases, find-the-value-of-k questions, and how to choose between factorising, completing the square and the formula. Matched to GCSE Higher (AQA, Edexcel, OCR) and IGCSE Extended (Edexcel, Cambridge). Every answer worked in full, and every number checked by hand before it was recorded. Timestamps below. Pause where the PAUSE cue appears and actually attempt them — that is the part that makes it stick. #GCSEMaths #QuadraticFormula #Discriminant #Year11 #NovaGCSE ⏱️ Chapters: 0:00 Knowing the answer before you solve 0:17 What you'll be able to do 0:52 Anatomy of the formula: a, b and c 2:00 Worked examples and the −b sign trap 4:12 The −b trap and three habits that beat it 5:35 Your turn — using the formula 6:55 Surd-form answers and simplifying the root 8:47 Your turn — surd form 10:01 The discriminant: three cases 12:36 A zero discriminant, drawn properly 13:44 Working backwards: find k 14:57 Your turn — the discriminant 16:03 Which method? A 5-second decision 17:17 Showing the method 18:31 Final challenge 20:31 Recap and next week New lesson every week, matched to where you actually are in the term. Year 10 and Year 11 Maths and Physics, Monday to Thursday at 5pm. This video uses AI-generated narration and visuals as part of our production process. Full Year 11 Maths playlist: PASTE_PLAYLIST_URL_HERE