The number 5 is called the base and the integer 2 is called the exponent.

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**Video Instruction**: Exponential Notation ]Another way to read the above example is "5 raised to the second power."

**Simplify.**

It is important to point out the last two solved problems, what is different?

The square root can be thought of as the opposite of squaring a number. In other words, if we want the square root of 16 the question is "what number squared gives 16?" Actually there are two answers to this question, 4 and −4 because:Hence, there is a technical distinction here. When we are asked for the square root of numbers we mean the principal (non-negative) square root.

**Simplify**.

If

Look for the largest perfect square factor and the apply this property as follows:*A*and*B*are positive and real the following property is useful for simplifying square roots:**Video Examples on YouTube**: