When to use this calculator
Find both real or complex roots of a quadratic equation. Returns a stable pair for distinct real roots and a conjugate form for complex roots. Extreme coefficients can still exceed floating-point accuracy.
Explore the algebra & number calculators for other questions in this topic. For a related calculation, use the Quadratic Vertex X Calculator: Find the horizontal coordinate of a parabola’s vertex.
PUTTING IT INTO PRACTICE
Quadratic Formula: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Quadratic coefficient a | 1 |
| Linear coefficient b | -5 |
| Constant c | 6 |
| Result | 2, 3 |
- Check the input labels and enter the example values above.
- Apply the relationship: Roots = (−b ± √(b²−4ac))/(2a)..
- The result is 2, 3 , rounded for display.
How to interpret your result
Returns a stable pair for distinct real roots and a conjugate form for complex roots. Extreme coefficients can still exceed floating-point accuracy.
Identify whether the question asks for one term, a total or a count of possible selections. Sequences use a fixed difference or ratio. In counting problems, order and replacement determine the correct model.
Frequently asked questions
Do combinations and permutations count the same thing?
No. Combinations ignore the order of selection; permutations count different orders separately.
When is the quadratic formula calculator useful?
Find both real or complex roots of a quadratic equation. Returns a stable pair for distinct real roots and a conjugate form for complex roots. Extreme coefficients can still exceed floating-point accuracy.
How do I use the quadratic formula calculator?
Enter quadratic coefficient a, linear coefficient b, constant c. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Roots = (−b ± √(b²−4ac))/(2a)..
What should I check before using the result?
Returns a stable pair for distinct real roots and a conjugate form for complex roots. Extreme coefficients can still exceed floating-point accuracy.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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