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.
One simple way to solve quadratic equations is to set each factor equal to zero and then solve for each factor. However, when the quadratic equation is difficult to solve, the quadratic formula is used to find the solutions.