By Gerald Erichsen. There are few things more confusing for beginning Spanish students, at least those who have English as their first language, than learning the differences between ser and estar. After all, they both mean to be in English.I'm not using the terms in a grammatical sense here.) Ser tells you what something is, the nature of its being, while estar refers more to what something does. I might use soy (the first-person present of ser) to tell you what I am, but I'd use estoy (the first-person present of estar) to tell you what I am being.
In mathematics, a quadratic form is a homogeneous polynomial of degree two in a number of variables. For example, + â is a quadratic form in the variables x and y.
Quadratic functions are functions in which the 2nd power, or square, is the highest to which the unknown quantity or variable is raised.. The function y=x2 or f(x) = x2 is a quadratic function, and is the parent graph for all other quadratic functions. The shortcut to graphing the function f(x) = x2 is to start at the point (0, 0) (the origin) and mark the point, called the vertex. Note that the point (0, 0) is the vertex of the parent function only. In calculus, this point is called a critical point, and some pre-calculus teachers also use that terminology.