expand (x-3)^2

firstly explain (x-3)2 = (x-3)(x-3) on the whiteboard I'd draw a square grid with each of the numbers, then I'd multiply out. E.g. x multiplied by x = x2; x multiplied by -3 = -3x and so on.. (remembering that multiplying 2 negative numbers gives you a positive number) Then you can put them in order to give you x2-6x+9 Could also go on to explain that if the question were asking what for a solution to the question 0= (x-3)2 then your answer would be x=3 as (3-3)2 = (0)2 = 0. Also could potentially give some context with putting into a graph and showing how you would plot if the question was y = x2-6x+9

IT
Answered by Imogen T. Maths tutor

8522 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

How do you solve two simultaneous equations? (i.e. 5x + y =21 and x - 3y =9)


How do I expand and simplify linear equations?


How do you substitute a number into an algebraic expression?


An area of a garden needs to be tiled. It consists of a square area of 10m by 10m, with an outdoor pool in the middle of radius 3m. The tiles to be used are 50cm by 50cm, and cost 50p per tile. Find out how much it will cost to tile the area.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences