A High School Math Problem Which Is a Lot Easier Than It Looks

This problem at first glance looks hard, but with the right method it is remarkably easy to solve

One of the most satisfying types of math problems to take on are those which look very hard on first sight, but turn out to be fairly easily solvable as long as you know the right method to apply.

Here is such a problem. Take a quick look and then see if you know how to solve it before I dive into the method I used: