If *“a” *is any non-negative number than its square root is any non-negative number whose square is *“a**“***.** We write the square root of n as **√****n**.* *Roots are also referred to as radicals. A square root is never a negative number. If we are speaking of a negative square root of 9 for example we would write is like: *-√9. *

The cube root of a real number *“a” *is the number whose cube is a. The cube root of a is written as “*3√a”.*

The fourth root of the non-negative number a is defined as the non-negative number whose fourth power is a and written as *“4**√a”.*

**Rational Exponents**

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