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Write quadratic expressions in completed square form

Complete the square for a quadratic expression

3 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.

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Grade 6–9 Core 🇬🇧 UK

Completing the Square - GCSE Higher Maths

1st Class Maths 310K views

Clear GCSE walkthrough of writing quadratics in completed square form, building from easy to harder examples.

Jump to 0:00What is completing the square?0:31How does it work?3:29A first example of completing the square 5:18A second example of completing the square with steps 6:40A third example of completing the square 7:57A more difficult example

Grade 6–8 Core 🇬🇧 UK

GCSE Maths - How to Factorise Quadratics by Completing the Square (Part 1 - Factorise When a=1)

Cognito 561K views

Concise Cognito lesson on rewriting quadratics into (x+p)²+q form with two worked examples.

Jump to 0:00Intro to Completing the Square 0:14The Completed Square Form 1:32Step 1: Ensure Standard Format 1:57Step 2: Apply the Formula 2:48Step 3: Simplify (Example 1)3:39Example 2

Grade 6–9 Core 🇬🇧 UK

Completing the Square - Corbettmaths

corbettmaths 965K views

Corbettmaths explains completing the square and then using it, a trusted UK GCSE revision source.