How do I factorise quadratic equations?

To factorise an expression such as x 2 - 8x + 15, you need to look for two numbers that add up to make -8 and multiply to give 15.
The only option in this case is -5 and -3
(-5)+(-3)=-8and (-5)x(-3)=15as two negative numbers multiply to a positive number.

Answered by Miss Georgina R M. Maths tutor

2671 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

x^2-9x+20=0


( 9x3) + (18 /3)


Solve: 4(3x − 2) = 2x - 5


Solve (x/4)-(2x/x+2) = 1. Give your solutions to 2 decimal places. You must show your working.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences