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Use the definition of a derivative as a limit to write the slope function of . Confirm your slope function with the Power Rule. Then use your slope function to calculate and .

Hana's definition of the derivative: 

1. Substitute into Hana's definition
2. Expand the numerator
3. Combine like terms
4. Factor out an
5. Cancel out the
6. Evaluate the limit as
This is

Use the Power Rule to find . Compare to the you found algebraically. If they do not agree, you probably made an algebraic error.

Evaluate and .