Let the unary quadratic equation be: ax 2+bx+c = 0, where a is not 0, because in order to satisfy this equation as an unary quadratic equation, a cannot be equal to 0.

The formula for finding the root is: x = (-b √ (b? -4ac))/2a？ .

Extended data:

There are four solutions to the quadratic equation of one variable:?

1, direct Kaiping method.

2. Matching method.

3. Formula method.

4. Factorial decomposition method.

In the unary quadratic equation AX 2+BX+C = 0, △=b? -4ac .

1, when △ = 0, x=-b/2a, and there are two same roots.

2. when △ > 0, x = (-b √ (b? -4ac))/2a, with two different roots.

3. when △ < 0, x = (-b I √ (b? -4ac))/2a, with two imaginary roots.

References:

Baidu Encyclopedia-One-variable Quadratic Equation