Unit 2 Functions Continuity and End Behavior (Unit 2.3)

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1 Unit 2 Functions Continuity and End Behavior (Unit 2.3) William (Bill) Finch Mathematics Department Denton High School

2 Lesson Goals When you have completed this lesson you will: Identify whether a function is continuous. Identify 3 types of discontinuities. Describe the end-behavior of a function. Continuity / End Behavior 2 / 14

3 Lesson Goals When you have completed this lesson you will: Identify whether a function is continuous. Identify 3 types of discontinuities. Describe the end-behavior of a function. Continuity / End Behavior 2 / 14

4 Lesson Goals When you have completed this lesson you will: Identify whether a function is continuous. Identify 3 types of discontinuities. Describe the end-behavior of a function. Continuity / End Behavior 2 / 14

5 Lesson Goals When you have completed this lesson you will: Identify whether a function is continuous. Identify 3 types of discontinuities. Describe the end-behavior of a function. Continuity / End Behavior 2 / 14

6 Continuity The graph of a function is continuous if it has no breaks or gaps. y x Continuity / End Behavior 3 / 14

7 Discontinuities Three types of discontinuities y y y x x x Infinite discontinuity at x = c Jump discontinuity at x = c Removable discontinuity at x = c Continuity / End Behavior 4 / 14

8 Limits As f (x) approaches some output L as the input x approaches some input c, then the limit of f (x) as x approaches c is L. lim f (x) = L x c Continuity / End Behavior 5 / 14

9 Continuity Test A function f (x) is continuous at x = c if: f (c) exists f (x) approaches the same output value from either side of c (this means lim x c f (x) exists) The output value the function approaches from either side of c is f (c) (this means lim x c f (x) = f (c)) Continuity / End Behavior 6 / 14

10 Continuity Test A function f (x) is continuous at x = c if: f (c) exists f (x) approaches the same output value from either side of c (this means lim x c f (x) exists) The output value the function approaches from either side of c is f (c) (this means lim x c f (x) = f (c)) Continuity / End Behavior 6 / 14

11 Continuity Test A function f (x) is continuous at x = c if: f (c) exists f (x) approaches the same output value from either side of c (this means lim x c f (x) exists) The output value the function approaches from either side of c is f (c) (this means lim x c f (x) = f (c)) Continuity / End Behavior 6 / 14

12 Continuity Test A function f (x) is continuous at x = c if: f (c) exists f (x) approaches the same output value from either side of c (this means lim x c f (x) exists) The output value the function approaches from either side of c is f (c) (this means lim x c f (x) = f (c)) Continuity / End Behavior 6 / 14

13 Example 1 Determine whether f (x) = 1 is continuous at x = 0.5 2x + 1 using the continuity test. If discontinuous, identify the type of discontinuity. Continuity / End Behavior 7 / 14

14 Example 2 Determine whether f (x) = 1 is continuous at x = 1 using x 1 the continuity test. If discontinuous, identify the type of discontinuity. Continuity / End Behavior 8 / 14

15 Example 3 Determine whether f (x) = x 2 is continuous at x = 2 x 2 4 using the continuity test. If discontinuous, identify the type of discontinuity. Continuity / End Behavior 9 / 14

16 End Behavior of a Function The end behavior of a function is a description of the output of the function as x goes left and right towards negative and positive infinity. Left-End Behavior lim f (x) = x Right-End Behavior lim f (x) = x + y x Continuity / End Behavior 10 / 14

17 Example 4 Use the graph of f (x) = x 3 x 2 4x + 4 to describe its end behavior. Continuity / End Behavior 11 / 14

18 Example 5 Use the graph of g(x) = x + 2 to describe its end x 2 x 2 behavior. Continuity / End Behavior 12 / 14

19 Example 6 In physics, the symmetric energy function is E = x 2 + y 2 2 If the y-value is held constant, what happens to the value of symmetric energy when the x-value approaches? Continuity / End Behavior 13 / 14

20 What You Learned You can now: Identify whether a function is continuous. Identify 3 types of discontinuities. Describe the end-behavior of a function. Do problems Chap 1.3 #1-11 odd, odd Continuity / End Behavior 14 / 14

21 What You Learned You can now: Identify whether a function is continuous. Identify 3 types of discontinuities. Describe the end-behavior of a function. Do problems Chap 1.3 #1-11 odd, odd Continuity / End Behavior 14 / 14

22 What You Learned You can now: Identify whether a function is continuous. Identify 3 types of discontinuities. Describe the end-behavior of a function. Do problems Chap 1.3 #1-11 odd, odd Continuity / End Behavior 14 / 14

23 What You Learned You can now: Identify whether a function is continuous. Identify 3 types of discontinuities. Describe the end-behavior of a function. Do problems Chap 1.3 #1-11 odd, odd Continuity / End Behavior 14 / 14

24 What You Learned You can now: Identify whether a function is continuous. Identify 3 types of discontinuities. Describe the end-behavior of a function. Do problems Chap 1.3 #1-11 odd, odd Continuity / End Behavior 14 / 14

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