14. Find the domain of the function $y=x^{2}$.
Solution. Obviously, for any real value of $x$, the function $y$ is also expressed as a real number. Therefore, the given function is defined for any value of $x \in(-\infty, \infty)$. This result can be written as $x \in \mathbb{R}$.

Let's note the peculiarities of finding the domain of some functions.