### Home > CALC > Chapter 3 > Lesson 3.4.1 > Problem3-150

3-150.

Use the definition of a derivative to find y′ if . Confirm your solution with the Power Rule. Homework Help ✎

Hana's Definition of derivative:

Substitute:

Expand the numerator and combine like terms.

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

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