x^2 - 5x - 12 = 2, solve for x

RHS should always be 0 so start by taking that across.Now we want two numbers, they need to add up to make - 5 and multiply to make -14.Solve for this and we get -7 and +2.Use this information to factorise: (x - 7)(x + 2) = 0One or the other bracket must equal 0 for this to be true, so x must equal 7 or - 2.Then go on to explain quadratic formula for cases where factorisation is not so easy.

PS
Answered by Pratinav S. Maths tutor

3167 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

What is a major use of completing the square?


x/x-1 - x/x+1 simplify


How to factorise equations, or expand factorised equations?


A = {multiples of 5 between 14 and 26}. B = {odd numbers between 14 and 26}. List the members of A∪B and A∩B.


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