The matching method is a solution to the quadratic equation of one variable, that is, the quadratic equation of one variable is matched into a complete square form, and then the square can be extracted. For an equation whose quadratic term is 1, in the formulation, first move the constant term to the right side of the equation, then add half the square of the quadratic term coefficient on both sides of the equation, and finally write the left side as a complete square, and the equation can be solved correctly. If the quadratic coefficient is not 1, first convert the quadratic coefficient into 1, just like a formula with a quadratic term of 1.