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Understanding the Relationship between f and f': Relating Graphs of f and f'

This lesson explores the relationship between a function f and its derivative f' through analyzing their graphs. Topics include increasing and decreasing functions, maximums, minimums, concavity, and inflection points.

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Understanding the Relationship between f and f': Relating Graphs of f and f'

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  1. Relating Graphs of f and f’

  2. Do Now: Answer each of the following questions. • When the function, f, is increasing, what does that mean about the derivative, f’? • When the function, f, is decreasing, what does that mean about the derivative, f’? • When the function, f, reaches a maximum at a smooth point, what does that mean about the derivative, f’? • When the function, f, reaches a minimum at a cusp, what does that mean about the derivative, f’? • When the function, f, changes from concave up to concave down, what does that mean about the derivative, f’, and the second derivative, f’’? • When the derivative, f’, has a positive slope, what does that mean about the second derivative, f’’?

  3. Using the previous information about the f, f’ and f’’, answer the following questions based on the graph of f on the right. • On what interval(s) is f’ positive? • On what interval(s) is f’ negative? • On what interval(s) is f’’ positive? • On what interval(s) is f’’ negative? • On what interval(s) are both f’ and f’’ positive? • On what interval(s) are both f’ and f’’ negative? • On what interval(s) is f’ positive and f’’ negative? • On what interval(s) is f’ negative and f’’ positive?

  4. Using the previous information about the f, f’ and f’’, answer the following questions based on the graph of f’ on the right. • For what value(s) of x does f have a horizontal tangent? • For what value(s) fo x does f have a relative maximum? • For what value(s) of x does f have a relative minimum? • On what interval(s) is f increasing? • On what interval(s) is f decreasing? • For what value(s) of x does f have a point of inflection? • On what intervals(s) is f concave up? • On what interval(s) is f concave down?

  5. Practice Problems Base your answers to each of the following questions based on the graph of f at right (justufy with a sentence): • On what interval(s) is f’ positive? • On what interval(s) is f’ negative? • On what interval(s) is f’’ positive? • On what interval(s) is f’’ negative? • On what interval(s) are both f’ and f’’ positive? • On what interval(s) are both f’ and f’’ negative? • On what interval(s) is f’ positive and f’’ negative? • On what interval(s) is f’ negative and f’’ positive?

  6. Practice Problems Base your answers to the following questions based on the graph of f’ at right (justify with a sentence): • For what value(s) of x does f have a horizontal tangent? • For what value(s) fo x does f have a relative maximum? • For what value(s) of x does f have a relative minimum? • On what interval(s) is f increasing? • On what interval(s) is f decreasing? • For what value(s) of x does f have a point of inflection? • On what intervals(s) is f concave up? • On what interval(s) is f concave down?

  7. Practice Base your answers to the following questions based on the graph of f’ at right (justify with a sentence): • For what value(s) of x does f have a horizontal tangent? • For what value(s) fo x does f have a relative maximum? • For what value(s) of x does f have a relative minimum? • On what interval(s) is f increasing? • On what interval(s) is f decreasing? • For what value(s) of x does f have a point of inflection? • On what intervals(s) is f concave up? • On what interval(s) is f concave down?

  8. Practice Base your answers to the following questions based on the graph of f’ at right (justify with a sentence): • For what value(s) of x does f have a horizontal tangent? • For what value(s) fo x does f have a relative maximum? • For what value(s) of x does f have a relative minimum? • On what interval(s) is f increasing? • On what interval(s) is f decreasing? • For what value(s) of x does f have a point of inflection? • On what intervals(s) is f concave up? • On what interval(s) is f concave down?

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