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3-150.

Use the definition of a derivative to write an equation for if . Confirm your answer with the Power Rule. Homework Help ✎

Hana's Definition of derivative:

Substitute:

Expand the numerator and combine like terms.

Factor an out of the numerator so you can 'cancel out' the  in the denominator.

Evaluate the limit. You should get the same derivative you found with the Power Rule.