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Home > AC > Chapter 12 > Lesson 12.4.1 > Problem 12-67


Evaluate the expression below when and .

Start by simplifying the expression.
Remember that when you multiply numbers with the same base,  you can add the exponents together.

Substitute the given values for and then simplify.
Fractional exponents represent a power and a root.
The root is determined by the denominator, and the power by the numerator.
For example, the exponent for means the th root of raised to the rd power.