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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