Equation in which there is at least one squared variable or a product of variables.

- Equation in which the unknown has an exponent of 2.
- The general form of the second-degree equation in one variable is A
*x*² + B*x*+ C = 0. - For this type of equation, the term unknown is used instead of the term variable, since the values of the unknown do not change.

### Example

The equation 2\({x^2}\) – 5*x* + 2 = 0 is a second-degree equation in one variable.

The values of the unknown *x* are {1/2, 2}.