GCSE Maths - How to Solve a Quadratic by Completing the Square (Part 2 - Solve When a=1) #53

This video covers how solve quadratics using the 'complete the square' technique.

This video is suitable for maths courses around the world.
KS3 - Not on your course
GCSE Foundation - Not on your course
GCSE Higher - All on your course

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[Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are:
- Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown.
- Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on.
- Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like.
- A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts.
- A comprehensive bank of past exam papers, organised both by year, and also by topic.

Amadeus & Tom

[hryanmahajan]

Who says superhero wear capes
This guy is a superhero he is doing such a great job he deserves 1 million subs
Salute to him

[mathzimmer]

Istg if i had money id tip people like u big time . Yall help free of cost omg

[ivashehu]

this is so incredibly helpful as always :) are you open to doing a-level maths videos?

[-Ray_Moon-]

Cognito- getting me through my GCSEs one video at a time

[ab-lata]

Thank you very very very much you helped me a lot.

[somtookafor]

Now I can know how to solve quadratic equations using ''completing the square method''😎

[magpiestudent]

Do you have a video to explain how to do these when the squared coefficient is greater than one?

[jadensully]

can you still complete the square if a= more than 1?? (so 2x^2 for example)

[Stash.Jd]

Taught me more in 1 minute than my teacher did in 170 minutes.

[majamalon]

Do u have to square root it or can you just leave it?

[suhaangoyal]

But what to do if the coefficient of X^2 is not 1 .. Can u pls make video on those sums

[catherinvarughese]

Hey can you please upload a video on how to complete the square when a is not equal to 1 ??

[stephaniemachado]

Hi Cognito!

Quick question so, If you have a question like x^2 -10x + 18

1. You find a, b, c.

2. You do the (x + b/2)^2 - (b/2)^2 to get the (x + p)^2 + q form

3. THEN, With the (x + p)^2 + q form with a = 0 at the end you rearrange the equation to get x by itself.

4. Then you are left with 2 possible solutions.

Is that correct?

[eden]

this tuaght me more than my maths teacher could

[pmmt]

Excellent ! Wich police do you use for your text ?
Or it s writting with a pencil ?
Thanks for any answer 🙂

[hamzasherasmat]

Are you going to do a video about completing the square when a isn't 1? It's a bargain. 5 minutes and you learn the content rather than sitting a week in class

[romaisayaqoob]

Your videos are superb!! Can you make a video on detection of radioactive radiations? I have my O'levels next month..

[rbbie]

what if the co efficient isn't 1?

[mrqwerty]

i dont know how to get the first -7 in the first example