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Wednesday, January 28, 2015MAT 145

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Wednesday, January 28, 2015MAT 145 Which of the following... ?True or False? Explain!

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Wednesday, January 28, 2015MAT 145 Match the expression in the left column (A thru F) with its correct description in the right column (1 thru 6). Explain your determination of each correct match!

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Wednesday, January 28, 2015MAT 145 Match the expression in the left column (A thru F) with its correct description in the right column (1 thru 6). Explain your determination of each correct match!

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Wednesday, January 28, 2015MAT 145

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Wednesday, January 28, 2015MAT 145 A B C D E

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Wednesday, January 28, 2015MAT 145 Calculate the slope at x = −2. Calculate the slope at x = −1. Calculate the slope at x = 0. Calculate the slope at x = a.

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Wednesday, January 28, 2015MAT 145 Calculate the slope of f(x) = x 2 at x = a.

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Wednesday, January 28, 2015MAT 145 We call this slope calculation the derivative of f at x = a.

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Wednesday, January 28, 2015MAT 145

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Wednesday, January 28, 2015MAT 145

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Wednesday, January 28, 2015MAT 145

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Wednesday, January 28, 2015MAT 145 The value f ’(a) is called: the derivative of f at x = a, the instantaneous rate of change of f at x = a, the slope of f at x = a, and the slope of the tangent line to f at x = a.

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Wednesday, January 28, 2015MAT 145 The derivative in action! S(t) represents the distance traveled by some object, where t is in minutes and S is in feet. What is the meaning of S’(12)=100?

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Wednesday, January 28, 2015MAT 145 The derivative in action! C(p) represents the total daily cost of operating a hospital, where p is the number of patients and C is in thousands of dollars. What is the meaning of C’(90)=4.5?

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Wednesday, January 28, 2015MAT 145 The derivative in action! V(r) represents the volume of a sphere, where r is the radius of the sphere in cm. What is the meaning of V ’(3)=36π?

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Wednesday, January 28, 2015MAT 145 Can we create a derivative function f that will be true for any x value where a derivative exists?

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Wednesday, January 28, 2015MAT 145

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Wednesday, January 28, 2015MAT 145

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Wednesday, January 28, 2015MAT 145 The slope of this secant line differs from the slope of the tangent line by an amount that is approximately proportional to h. As h approaches zero, the slope of the secant line approaches the slope of the tangent line. Therefore, the true derivative of f at x is the limit of the value of the slope function as the secant lines get closer and closer to being a tangent line.

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Wednesday, January 28, 2015MAT 145 Calculate the derivative function, f ’(x), for f(x) = x 2. Use the limit definition of the derivative.

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Wednesday, January 28, 2015MAT 145

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Wednesday, January 28, 2015MAT 145

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