Absolute Extrema Lesson 6.1.

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Presentation transcript:

Absolute Extrema Lesson 6.1

Fencing the Maximum You have 500 feet of fencing to build a rectangular pen. What are the dimensions which give you the most area of the pen Experiment with Excel spreadsheet

Intuitive Definition Absolute max or min is the largest/smallest possible value of the function Absolute extrema often coincide with relative extrema A function may have several relative extrema It never has more than one absolute max or min

Reminder – the absolute max or min is a y-value, not an x-value Formal Definition Given f(x) defined on interval The number c belongs to the interval Then f(c) is the absolute minimum of f on the interval if … for all x in the interval Similarly f(c) is the absolute maximum if for all x in the interval Reminder – the absolute max or min is a y-value, not an x-value c f(c)

Functions on Closed Interval Extreme Value Theorem A function f on continuous close interval [a, b] will have both an absolute max and min on the interval Find all absolute maximums, minimums

Strategy To find absolute extrema for f on [a, b] Find all critical numbers for f in open interval (a, b) Evaluate f for the critical numbers in (a, b) Evaluate f(a), f(b) from [a, b] Largest value from step 2 or 3 is absolute max Smallest value is absolute min

Try It Out For the functions and intervals given, determine the absolute max and min

Graphical Optimization Consider a graph that shows production output as a function of hours of labor used We seek the hours of labor to use to maximize output per hour of labor. Output hours of labor

Graphical Optimization For any point on the curve x-coordinate measures hours of labor y-coordinate measures output Thus We seek to maximize this value Note that this is also the slope of the line from the origin through a given point Output hours of labor

Graphical Optimization It can be shown that what we seek is the solution to the equation Now we have the (x, y) where the line through the origin and tangent to the curve is the steepest Output hours of labor

Assignment Lesson 6.1 Page 372 Exercises 1 – 53 odd