What can I say about the roots of a quadratic equation without actually calculating them?

  • Google+ icon
  • LinkedIn icon

If a quadratic equation is of the form ax2+bx+c, calculate D (Discriminant) whose value is b2-4ac. 

If the value of D is negative, the equation has imaginary roots.

If the value of D is positive, the equation has real and distinct roots.

If the value of D is zero, the equation has real and equal roots.

Swapnil S. GCSE Maths tutor, GCSE Physics tutor, GCSE Chemistry tutor...

About the author

is an online GCSE Maths tutor with MyTutor studying at Manchester 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