Math
Quadratic Equation Calculator
Find the roots of a quadratic equation of the form ax squared plus bx plus c equals zero.
Formula
Roots = (−b ± square root of (b squared − 4ac)) ÷ 2a. The value b squared − 4ac is the discriminant.
How it works
Enter a, b, and c with a not zero. The calculator checks the discriminant: positive gives two real roots, zero gives one repeated root, negative gives no real roots.
FAQs
What does the Quadratic Equation do?
It takes the values you enter and works out the quadratic equation for you, showing the result straight away.
What should I enter?
Enter ordinary numbers in the boxes above. If a value does not make sense for this calculation, the page will ask you to check it instead of showing a wrong answer.
Can I use the result for homework or everyday maths?
Yes. It is a general-purpose maths helper; for exam or professional work, still check the steps against your own working.