1. The direct leveling method is called direct leveling method.

The direct Kaiping method is suitable for solving quadratic equations with one variable. According to the definition of square root, x+a is the square root of b when; When b<0, the equation has no real root.

2. Matching method

Matching method is an important mathematical method, which is not only suitable for solving quadratic equations with one variable, but also widely used in other fields of mathematics.

The theoretical basis of the matching method is the complete square formula. If a in the formula is regarded as an unknown x and replaced by x, there is.

3. Formula method

Formula method is a method to solve the quadratic equation of one variable by finding the root formula, and it is a general method to solve the quadratic equation of one variable.

Quadratic equation with one variable? Root formula of:

4, factorization method

Factorization is to find the solution of the equation by factorization. This method is simple and easy to use, and it is the most commonly used method to solve the quadratic equation of one variable.

Extended content: Vieta theorem:

The relationship between the root and coefficient of quadratic equation (the following two formulas are very important and often used in exams)

General formula: the relationship between two roots of ax2+bx+c=0 x 1 and x2:

x 1+x2= -b/a

x 1 x2=c/a