Mobile projects,

ax^2+bx = -c

One on each side, and then formulated,

x^2+(b/a)x+(2a)^2 =-2a)^2)

[x + b/(2a)]^2 = [b^2 - 4ac]/(2a)^2

Open square roots on both sides and get the solution.

x = [-b √(b2-4ac)]/(2a)

Extended data:

Basic definition

Generally speaking, it is shaped like

A function (a, b and c are constants) is called a quadratic function, where a is called a quadratic term coefficient, b is a linear term coefficient and c is a constant term. X is the independent variable and y is the dependent variable. The maximum number of independent variables to the right of the equal sign is 2.

Vertex coordinates

The intersection is

(only applicable to parabolas intersecting the x axis),

The coordinates intersecting the x axis are

and

. Note: "Variable" is different from "unknown", so it cannot be said that "quadratic function means that the polynomial function with the highest number of unknowns is quadratic". "Unknown" is just a number (the specific value is unknown, but only one value is taken), and "variable" can take any value within a certain range. The concept of "unknown" is applied in the equation (both functional equation and differential equation are unknown functions, but both unknown and unknown functions generally represent a number or function-special circumstances may occur), but the letters in the function represent variables and their meanings have always been different. From the definition of function, we can also see the difference between them.