How do you solve a quadratic equation? I always forget how to do that!

x2+4x+3=0 The first step is to factorise. To do this you need to find a pair of factors of 3 that add together to make 4. I recommend listing the factors of 3 to start with. Don't forget the negatives! 1 and 3 (add to 4) -1 and -3 (add to -4) So now we have (x+1)(x+3)=0 The only way you can get 0 when you multiply two numbers together is if one of those numbers is 0. Therefore we set each of the brackets equal to 0 and solve. x+1=0 x=-1 x+3=0 x=-3

Answered by Hannah D. Maths tutor

2813 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve for x and y, with x and y satisfying the equations x+4y=5 and 2x+2y=16.


Fully expand (2x+4)(4x-3).


Expand and simplify the following expression: x(5x – 2) – 3(x2 – 2x + 7)


A shopkeeper compares the income from sales of a laptop in March and in April. The price in April was 1/5 more than in March. The number sold in April was 1/4 less than in March. By what fraction does income decrease from March to April?


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