I am assuming that you are familiar with squaring a bracket. If not I would encourage you to look at this short video first before tackling completing the square.

In this series of three tutorials I take you through all the different types, depending on the x^{2} term.

## Completing the square for when you get x^{2} terms only

## Completing the square for when you get 2x^{2}, 3x^{2},… terms

## Completing the square for when you get -x^{2}, -2x^{2},… terms

AliciaNovember 1, 2016 at 2:14 pmIn the second video the fourth example shouldnt half of 3 equal 3/2 and not 3/5?? I dont see where you got that from. Is it just a mistake or?

SwampsNovember 2, 2016 at 3:55 pmYour’e dividing 3 by 5, not halving it.

AbdullahFebruary 20, 2017 at 5:32 pmIt’s not halved at the start, he took out 5 as a common factor from both of the terms, common factor 5 from 3 will be 3/5 .. then he halved to make it 3/10

ChadNovember 26, 2016 at 1:20 pmHi, on the second video for the seccond example . the example 2xsquared-x-1 when converted into 2 (x-1/4)squared-1/16. i am confused as to when you expanded the brackets and got 2 (x-1/4)squared-1/8.

I seem to get 2/1.

I did 1/16 x 2/1 which converts to 1/16 x 32/16 = 4/2 = 2/1

ChadNovember 26, 2016 at 2:42 pmah i see where i messed up I did the multiplication wrong across the fractions. silly mistake

RiriDecember 8, 2016 at 7:12 pmAt the last part of the last expression why did you make the 2 be 40 over 20?

JohnJanuary 5, 2017 at 7:51 pmThis was in order to add the fractions

AlastairJanuary 1, 2017 at 10:17 amThank you. Everything beautifully explained.

Alastair MachinJanuary 8, 2017 at 11:47 amHi

I am struggling to solve 5x>2 +3x-1 =0 by completing the square.

How do i post on the forum?

Thank you

Alastair

Alastair MachinJanuary 8, 2017 at 12:27 pmOK I have got it!

Thanks Alastair