Lost and Found Department
This is to inform all students that the school has set up a 'Lost and Found Department' in the main office. Any student who has lost an item is requested to report the following details:
- A brief description of the lost item
- The date, time, and location where it was lost
- Contact information
Please report all lost items promptly to help us return them to their rightful owners.
For more information, visit the Lost and Found Department.
President, Lost and Found Department
Find the interval in which $f(x) = x + \frac{1}{x}$ is always increasing, $x \neq 0$.