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Chapter 7.8 Inverse Functions and Relations Standard & Honors
Algebra II Mr. Gilbert Chapter 7.8 Inverse Functions and Relations Standard & Honors 11/29/2018
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Agenda Warm up Homework Review Lesson Homework
7.7 Operations on Functions Lesson Homework 11/29/2018
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Click the mouse button or press the Space Bar to display the answers.
11/29/2018 Click the mouse button or press the Space Bar to display the answers. Transparency 8
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11/29/2018 Transparency 8a
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Homework Review 11/29/2018
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Communicate Effectively
Domain & Range Inverse Relation : see below Inverse Function : f(x), f-1(x) Identity Function I(x)=x Two relations in an inverse if and only if whenever one contains (a,b) then the other contains (b,a). {this means all elements are included} 11/29/2018
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7.8 Inverse Functions and Relations
Example 1 Find an Inverse Relation (3) Example 2 Find an Inverse Function (5) Example 3 Verify Two Functions are Inverses (3) 11/29/2018 Lesson 8 Contents
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Geometry The ordered pairs of the relation {(1, 3), (6, 3), (6, 0), (1, 0)} are the coordinates of the vertices of a rectangle. Find the inverse of this relation and determine whether the resulting ordered pairs are also the coordinates of the vertices of a rectangle. To find the inverse of this relation, reverse the coordinates of the ordered pairs. The inverse of the relation is {(3, 1), (3, 6), (0, 6), (0, 1)}. 11/29/2018 Example 8-1a
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Answer: Plotting the points shows that the ordered pairs also describe the vertices of a rectangle. Notice that the graph of the relation and the inverse are reflections over the graph of y = x. 11/29/2018 Example 8-1b
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Geometry The ordered pairs of the relation {(–3, 4), (–1, 5), (2, 3), (1, 1), (–2, 1)} are the coordinates of the vertices of a pentagon. Find the inverse of this relation and determine whether the resulting ordered pairs are also the coordinates of the vertices of a pentagon. Answer: {(4, –3), (5, –1), (3, 2), (1, 1), (1, –2)} These ordered pairs also describe the vertices of a pentagon. 11/29/2018 Example 8-1c
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Step 1 Replace f (x) with y in the original equation.
Find the inverse of Step 1 Replace f (x) with y in the original equation. Step 2 Interchange x and y. 11/29/2018 Example 8-2a
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Step 4 Replace y with f –1(x).
Step 3 Solve for y. Inverse Multiply each side by –2. Add 2 to each side. Step 4 Replace y with f –1(x). Answer: The inverse of is 11/29/2018 Example 8-2b
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Graph the function and its inverse.
Graph both functions on the coordinate plane. The graph of is the reflection for over the line 11/29/2018 Example 8-2d
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Answer: 11/29/2018 Example 8-2e
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b. Graph the function and its inverse. Answer:
a. Find the inverse of b. Graph the function and its inverse. Answer: Answer: 11/29/2018 Example 8-2f
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Determine whether and are inverse functions.
Check to see if the compositions of f (x) and g (x) are identity functions. 11/29/2018 Example 8-3a
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Answer: The functions are inverses since both and equal x.
11/29/2018 Example 8-3b
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Determine whether and are inverse functions.
Answer: The functions are inverses since both compositions equal x. 11/29/2018 Example 8-3c
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Homework - Honors See Syllabus 7.8 pp. 393-394: 18, 20-36 even, 38-44
11/29/2018
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Homework See Syllabus 7.8 PP even, 11/29/2018
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