Quadratic equation solver
Solve the quadratic equation ax² + bx + c = 0: calculate the discriminant, roots and parabola vertex.
ax² + bx + c = 0
Roots
2; 1
Discriminant1
Parabola vertex(1.5; -0.25)
Calculations are based on Estonia's tax rates in force for 2026. Results are informational.
Last updated: 2026-06-03
How to solve a quadratic equation?
A quadratic equation is solved with x = (−b ± √D) / 2a, where the discriminant D = b² − 4ac. If D > 0 there are two roots, if D = 0 one root, and if D < 0 there are no real roots.
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