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Simplifying nth Roots

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Simplifying nth Roots

- There is a very important form for simplifying radicals.

When the index and the exponent are the same value, the result is base b.

There is an exception in using this rule, and it will be discussed later.

- Example 1

- Example 2

- Example 3

- The exception to the rule occurs when both of the following apply:

n is even

b is negative

- Example 4

Note that we have an exception since:

n is even

b is negative

Simplifying without using the new rule …

Consider how the answer …

… compares with the original value of b.

Answer

= absolute value of b.

n is even

b is negative

This suggests a new rule when the exception conditions are met:

Exception

When both statements are true…

… evaluate as follows:

SUMMARY

- Example 5

Exception?

n = 4 is even

b= - 5 is negative

- Example 6

Exception?

n = 3 is odd

no exception

- Example 7

Exception?

n = 4 is even

b= 2xcould be negative if x was negative

Since its only the x that can be negative, we can also write …

END OF PRESENTATION