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# Square Root

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In this section, we learn about Square Roots and higher-level roots such as cube roots, fourth roots,…etc. 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 an 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.

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