# In this Section:

In this section, we learn about roots. We begin our process by learning about the most basic of all roots, the square root.
The square root of a number such as 9, is a number that when multiplied by itself gives us back the number 9. Two such numbers would be 3, and (-3). If we multiply 3 •
3 we get 9, also if we multiply (-3) • (-3) we get 9. Therefore the square root of 9 is 3 or (-3). We then move into some basic notation issues that occur when dealing
with roots in general. We introduce something known as an irrational number, and discuss the difference between a rational and irrational number. We find that any number whose
square root is a rational number is called a perfect square. We wrap up the section by showing what to do when we have higher level roots.