Factorise x^2+2x-8

Firstly, note the general equation for a quadratic: ax^2+bx+c. We can see that in the above equation, a=1, b=2 and c=-8. When factorising we have to consider the product ac and b. ac=1(-8)=-8 and b=2. Now think, what two numbers multiply to give -8 and add to give 2? That would be 4 and -2. So now the equation becomes (x-2)(x+4) which is the answer.

KT
Answered by Katie T. Maths tutor

7774 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

How do you solve these simultaneous equations? 4x + 5y = 8; 2x + 3y = 5


Bhavin, Max and Imran share 6000 rupees in the ratios 2 : 3 : 7 Imran then gives 3/5 of his share of the money to Bhavin. What percentage of the 6000 rupees does Bhavin now have? Give your answer correct to the nearest whole number.


If A is divided by B, the result is 5/7. If B is divided by C, the result is 4/5. What is the result of A divided by C ?


Solve the quadratic function x^2 + 3x + 2


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