Constraints on Inequation Representation
This activity belongs to the GeoGebra book GeoGebra Principia.
However, not always does the algebraic equation allow GeoGebra to represent the corresponding inequations. As shown in the official manual 
, this representation is limited to the following cases:
, this representation is limited to the following cases:
- Polynomial inequalities in one variable, like x³ > x + 1
- Quadratic inequalities in two variables, like x² + y² + x y < 4
- Linear inequalities in one of the variables, like 2x > sen(y) or y < sqrt(x).
- Note: The common quadratic equation of the ellipse and hyperbola is nothing but the general equation of a conic a x² + b x y + c y² + d x + e y + f = 0, where the ellipse and the hyperbola differ only by the sign of the discriminant b² – 4 a c.
Author of the construction of GeoGebra: Rafael Losada.