Rates of Change Lesson 3.3.

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Presentation transcript:

Rates of Change Lesson 3.3

Rate of Change Consider a table of ordered pairs (time, height) T H 0.00 200 0.25 199 0.50 196 0.75 191 1.00 184 1.25 175 1.50 164 1.75 151 2.00 136 2.25 119 2.50 100 2.75 79 3.00 56 3.25 31 3.50 4 Using this data, how could we find the speed (in feet per second) of the sky diver?

Average Rate of Change Recall formula for slope of a line through two points For any function we could determine the slope for two points on the graph This is the average rate of change for the function on the interval from x1 to x2

Calculate the Average Rate of Change View TI Nspire Demo

Difference Quotient The average range of change of f(x) with respect to x As x changes from a to b is This is known as the difference quotient Possible to have calculator function for difference quotient Note: use of the difquo() function assumes the definition of f(x) exists in the calculator memory

Try It Out Given a function f(x) Define in your calculator Now determine the average rate of change for f(x) between x=2 and x = 5 x = -4 and x = -3 h = 3 h = ?

Rate of Change from a Table Consider the increasing value of an investment Determine the rate of change of the value for successive years Is the rate of change a) decreasing, b) same, c) increasing ? Year Value $500.00 1 $550.00 2 $605.00 3 $665.50 4 $732.05 5 $805.26 6 $885.78 7 $974.36 8 $1,071.79 9 $1,178.97 10 $1,296.87

Instantaneous Rate of Change Rate of change for a large interval is sometimes not helpful Better to use points close to each other

Instantaneous Rate of Change What if we let the distance between the points approach zero Note that the difference quotient seems to approach a limit

Instantaneous Rate of Change Given Find the instantaneous rate of change at x = 1 We seek Problem … h ≠ 0 Strategy Evaluate difference quotient using 1 Simplify Now let h = 0

Instantaneous Rate of Change Calculator can determine limits Define f(x) Invoke limit function Variable to take to the limit Limit to use Expression to find limit of Instantaneous rate of change = 2

Assignment Lesson 3.3 Page 189 Exercises 1 – 35 odd