# quadratic

/kwɑˈdɹɑtɪk/ (US) · /kwɒdɹˈætɪk/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/quadratic
Updated: 2026-05-18

## Definition

a mathematical equation that includes a variable raised to the power of two. It usually looks like ax² + bx + c = 0.

For teachers: a polynomial equation of the second degree, typically expressed in the form ax² + bx + c = 0. The term also describes a function whose highest degree term is squared.

## Examples

- The student solved the quadratic equation using the formula.
- To find the roots of the quadratic, you can use the quadratic formula or complete the square.
- The trajectory of the projectile follows a parabolic path, which is a classic example of a quadratic function in physics.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.