Quadratic equations and inequalities
Calculate delta, roots, quadratic equations, and inequalities, then follow each step of the solution on a graph.
Use the quadratic function calculator to quickly calculate delta and roots, and see each step of solving a quadratic equation.
Enter data
You can enter your own coefficients or generate an example for practice.
Theory and examples
Understand quadratic functions step by step
The calculator helps you calculate delta, roots, and solution intervals, while short lessons show where each step comes from. Start with the basics or go straight to the graph, formula, or roots.
Quadratic function from scratch
What a quadratic function is, what a parabola looks like, and why coefficient a matters so much.
FormulasQuadratic function formulas
General, vertex, and factored forms, and the information that is easiest to read from each.
GraphQuadratic function graph
How to draw a parabola, find the vertex and axis of symmetry, and read monotonicity.
RootsRoots and delta
How delta tells you the number of roots and how to solve quadratic equations.