Question

А что обозначает x1 и x2&

Answer 1

Вероятнее всего - корни уравнения.

Answer 2

x1 and x2 are variables that are commonly used in mathematical equations and programming languages. The specific meaning of these variables can vary depending on the context in which they are used. Without more information about the specific equation or programming code you are referring to, it is difficult to provide a more precise answer.

If you can provide more details or context about the equation or code you are referring to, I would be happy to help you further.