# Bivariate (two variable) quadratic function(x minimum/maximum)

## Description

A bivariate (two variable) quadratic function is a second-degree polynomial which describes a quadratic surface and has the form: f(x,y)=Ax^2 + By^2 + Cx + Dy + Exy + F

If 4AB-E^2>0 the function has a minimum if A>0, and a maximum if A<0

## Variables

x_{m} | The x minimum or maximum (dimensionless) |

B | Quadratic coefficient for y (dimensionless) |

C | Linear coefficient for x (dimensionless) |

D | Linear coefficient for y (dimensionless) |

E | Coefficient for xy (dimensionless) |

A | Quadratic coefficient for x (dimensionless) |