Square Roots:

Here are a few square roots:

The first two popped cleanly (because they had perfect squares inside.)  But, the last guy didn't.  He's an irrational number.  His decimal part goes on forever and ever and never repeats.

Just like ! 

The reason I used " " instead of a regular " = " is because I can't really write the exact number down.

   means  " approximately = "

When roots like don't pop cleanly, in math, we just leave them as radicals.  It's more accurate this way!

So...   ?     Just leave it as !  Done!

We cannot do square roots like this yet:

This negative is a problem.

There IS an answer for this guy, but you'll learn about it later.