   Product Rule and Quotient Rule
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Video Lecture 8 of 18
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### Lecture Description

In this video lecture, Prof. Gilbert Strang discusses Product Rule and Quotient Rule.

How to find the slope of f(x) times g(x)?
Use the Product Rule.
The slope of f(x)g(x) has two terms:
f(x) times (slope of g(x)) PLUS g(x) times (slope of f(x))The Quotient Rule gives the slope of f(x) / g(x). That slope is[[ g(x) times (slope of f(x)) MINUS f(x) times (slope of g(x)) ]] / g squaredThese rules plus the Chain Rule will take you a long way.

### Course Description

Highlights of Calculus is a series of short videos that introduces the basics of calculus—how it works and why it is important. The intended audience is high school students, college students, or anyone who might need help understanding the subject.

The series is divided into three sections:
Introduction
- Why Professor Strang created these videos
- How to use the materials

Highlights of Calculus
- Five videos reviewing the key topics and ideas of calculus
- Applications to real-life situations and problems
- Additional summary slides and practice problems

Derivatives
- Twelve videos focused on differential calculus
- More applications to real-life situations and problems
- Additional summary slides and practice problems

Acknowledgements
Special thanks to Professor J.C. Nave for his help and advice on the development and recording of this program.The video editing was funded by the Lord Foundation of Massachusetts.