1. Chapter 2  2012 Pearson Education, Inc. Section 2.4 Rates of Change and Tangent Lines Limits and Continuity

2. Slide 2.4- 2  2012 Pearson Education, Inc. Quick Review

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8. Slide 2.4- 8  2012 Pearson Education, Inc. What you’ll learn about  Average Rates of Change  Tangent to a Curve  Slope of a Curve  Normal to a Curve  Speed Revisited …and why The tangent line determines the direction of a body’s motion at every point along its path

9. Slide 2.4- 9  2012 Pearson Education, Inc. Average Rates of Change The average rate of change of a quantity over a period of time is the amount of change divided by the time it takes. In general, the average rate of change of a function over an interval is the amount of change divided by the length of the interval. Also, the average rate of change can be thought of as the slope of a secant line to a curve.

10. Slide 2.4- 10  2012 Pearson Education, Inc. Example Average Rates of Change

11. Slide 2.4- 11  2012 Pearson Education, Inc. Tangent to a Curve In calculus, we often want to define the rate at which the value of a function y = f(x) is changing with respect to x at any particular value x = a to be the slope of the tangent to the curve y = f(x) at x = a. The problem with this is that we only have one point and our usual definition of slope requires two points.

12. Slide 2.4- 12  2012 Pearson Education, Inc. Tangent to a Curve The process becomes: 1.Start with what can be calculated, namely, the slope of a secant through P and a point Q nearby on the curve. 2.Find the limiting value of the secant slope (if it exists) as Q approaches P along the curve. 3.Define the slope of the curve at P to be this number and define the tangent to the curve at P to be the line through P with this slope.

13. Slide 2.4- 13  2012 Pearson Education, Inc. Example Tangent to a Curve

14. Slide 2.4- 14  2012 Pearson Education, Inc. Example Tangent to a Curve

15. Slide 2.4- 15  2012 Pearson Education, Inc. Slope of a Curve To find the tangent to a curve y = f(x) at a point P(a,f(a)) calculate the slope of the secant line through P and a point Q(a+h, f(a+h)). Next, investigate the limit of the slope as h→0. If the limit exists, it is the slope of the curve at P and we define the tangent at P to be the line through P with this slope.

16. Slide 2.4- 16  2012 Pearson Education, Inc. Slope of a Curve

17. Slide 2.4- 17  2012 Pearson Education, Inc. Slope of a Curve at a Point

18. Slide 2.4- 18  2012 Pearson Education, Inc. Slope of a Curve

19. Slide 2.4- 19  2012 Pearson Education, Inc. Normal to a Curve The normal line to a curve at a point is the line perpendicular to the tangent at the point. The slope of the normal line is the negative reciprocal of the slope of the tangent line.

20. Slide 2.4- 20  2012 Pearson Education, Inc. Example Normal to a Curve

21. Slide 2.4- 21  2012 Pearson Education, Inc. Speed Revisited

22. Slide 2.4- 22  2012 Pearson Education, Inc. Quick Quiz Sections 2.3 and 2.4

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26. Slide 2.4- 26  2012 Pearson Education, Inc. Quick Quiz Sections 2.3 and 2.4

27. Slide 2.4- 27  2012 Pearson Education, Inc. Quick Quiz Sections 2.3 and 2.4

28. Slide 2.4- 28  2012 Pearson Education, Inc. Chapter Test

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