How do I know how many roots a quadratic equation has?

  • Google+ icon
  • LinkedIn icon
  • 712 views

Let ax2 + bx + c = 0 be the equation in question where a,b,c are real numbers with a not equal to 0 (otherwise we would not have a quadratic).

 

If:

b2 - 4ac > 0 then there are two (real) roots

b2 - 4ac = 0 then there is exactly one (real) root

b2 - 4ac < 0 then there are no (real) roots.

Amit G. GCSE Maths tutor, A Level Maths tutor, 13 plus  Maths tutor

About the author

is an online GCSE Maths tutor with MyTutor studying at Warwick University

Still stuck? Get one-to-one help from a personally interviewed subject specialist.

95% of our customers rate us

Browse tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok