Free Quadratic Equation Solver Online
Free Quadratic Equation Solver Online is a free online tool by US AI. ax2+bx+c roots. It runs completely in your browser — no signup, no download, works on mobile and desktop.
📖 How to use
- Enter a, b and c for ax squared plus bx plus c equals zero, then press Solve to see the discriminant, roots and vertex.
- Open the tool with the button above — it loads instantly.
- Your work stays on your device; nothing is uploaded anywhere.
✨ Why use this tool?
US AI's free quadratic equation solver online is fast, private and 100% free forever. Bookmark this page and share it with anyone who needs it.
❓ Frequently asked questions
What is the quadratic formula?
For any equation ax^2 + bx + c = 0, the roots are x = (-b +/- sqrt(b^2 - 4ac)) / 2a. This solver computes them instantly from your a, b, and c values.
What does the discriminant tell me?
The discriminant b^2 - 4ac shows the nature of the roots: positive means two real roots, zero means one repeated root, and negative means the roots are complex.
Can the solver handle complex roots?
Yes. When the discriminant is negative, the solver reports the roots as complex numbers in a + bi form instead of failing.