Math Section Bekki George: 08/28/18. University of Houston. Bekki George (UH) Math /28/18 1 / 37
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1 Math 1431 Section Bekki George: University of Houston 08/28/18 Bekki George (UH) Math /28/18 1 / 37
2 Office Hours: Tuesdays and Thursdays 12:30-2pm (also available by appointment) Office: 218C PGH Course webpage: Bekki George (UH) Math /28/18 2 / 37
3 Questions Bekki George (UH) Math /28/18 3 / 37
4 Continuity A function f is said to be continuous at a point c if 1 f(c) is defined. 2 lim x c f(x) exists. 3 lim x c f(x) = f(c). Bekki George (UH) Math /28/18 4 / 37
5 Can you give an example of a function where step 1 fails but step 2 doesn t fail? Bekki George (UH) Math /28/18 5 / 37
6 Can you give an example of a function where step 2 fails but step 1 doesn t fail? Bekki George (UH) Math /28/18 6 / 37
7 Can you give an example of a function where step 3 fails but steps 1 and 2 don t fail? Bekki George (UH) Math /28/18 7 / 37
8 Types of discontinuity at a point 1 Removable: 2 Non-Removable - Jump: Bekki George (UH) Math /28/18 8 / 37
9 Types of discontinuity at a point 3 Non-Removable - Infinite: Bekki George (UH) Math /28/18 9 / 37
10 If functions f and g are continuous at the point x = c, then 1 f + g is continuous at c 2 f g is continuous at c 3 αf is continuous at c for each real number α 4 f g is continuous at c 5 f g is continuous at c provided g(c) 0 Lastly, - If g is continuous at c and f is continuous at g(c), then the composition f g is continuous at c. Bekki George (UH) Math /28/18 10 / 37
11 Where are polynomials continuous? Where are rational functions continuous? Bekki George (UH) Math /28/18 11 / 37
12 There is also One-Sided Continuity A function is continuous from the left at c if lim f(x) = f(c) x c and it is continuous from the right at c if lim f(x) = f(c) x c+ Bekki George (UH) Math /28/18 12 / 37
13 Examples: Discuss the continuity for each function. 1 f(x) = x + 2 x 2 x 6 Bekki George (UH) Math /28/18 13 / 37
14 2 f(x) = x2 + 2x x 2 4 Bekki George (UH) Math /28/18 14 / 37
15 3 f(x) = x + 5 x Bekki George (UH) Math /28/18 15 / 37
16 4 f(x) = x + 5 x 2 + 5x Bekki George (UH) Math /28/18 16 / 37
17 5 f(x) = x 3 Bekki George (UH) Math /28/18 17 / 37
18 6 f(x) = x 1 x 2 + 4x 5 Bekki George (UH) Math /28/18 18 / 37
19 7 f(x) = { x 3 x < 1 x x 1 Bekki George (UH) Math /28/18 19 / 37
20 8 f(x) = { 6 x 2 6 x > 2 Bekki George (UH) Math /28/18 20 / 37
21 x + 2 x < 2 4 x 2 2 x < 2 9 g(x) = 1 x = 2 x 2 x > 2 Bekki George (UH) Math /28/18 21 / 37
22 10 Find c so that h(x) is continuous. h(x) = { 2x 3 x < 2 cx x 2 x 2 Bekki George (UH) Math /28/18 22 / 37
23 1 Determine if the following function is continuous at the point where x = 3. 2x x < 3 g(x) = 27 x = 3 x 3 x > 3 Bekki George (UH) Math /28/18 23 / 37
24 x 2 x < 1 3 x = 1 2 Discuss the continuity of f(x) = 2 x 1 < x 1 1 x > 1 x 2 Bekki George (UH) Math /28/18 24 / 37
25 3 Find A and B so that f(x) is continuous. 2x 2 1 x < 2 f(x) = A x = 2 Bx 3 x > 2 Bekki George (UH) Math /28/18 25 / 37
26 Section The Intermediate Value Theorem A very important result of continuity is the Intermediate Value Theorem. If f(x) is continuous on the closed interval [a, b] and K is a value between f(a) and f(b), then there is at least one value c in (a, b) such that f(c) = K. Bekki George (UH) Math /28/18 26 / 37
27 Section The Intermediate Value Theorem Examples: Use the intermediate value theorem to show that there is a solution to the given equation in the indicated interval. 1 x 2 4x + 3 = 0 on the interval [2, 4] 2 x 3 6x 2 x + 2 = 0 on the interval [0, 3] Bekki George (UH) Math /28/18 27 / 37
28 Section The Intermediate Value Theorem 3 2 tan(x) x = 1 on the interval [ 0, π 4 ] 4 Show there is a value of x between 1 and 3 so that 3x 3 + 2x 4 = 7 Bekki George (UH) Math /28/18 28 / 37
29 Section The Intermediate Value Theorem 5 Does the Intermediate Value Theorem guarantee a solution to 0 = x 2 + 6x + 10 on the interval [ 1, 3]? Bekki George (UH) Math /28/18 29 / 37
30 Section The Intermediate Value Theorem 6 Does the Intermediate Value Theorem guarantee a solution to f(x) = 0 for f(x) = 2 sin(x) 8 cos(x) 3x 2 on the interval [ 0, π 2 ]? Bekki George (UH) Math /28/18 30 / 37
31 Section The Intermediate Value Theorem 7 Verify that the IVT applies to this function on the indicated interval and find the value of c guaranteed by the theorem. f(x) = x 2 3x + 1 on the interval [0, 6], f(c) = 5. Bekki George (UH) Math /28/18 31 / 37
32 Section The Intermediate Value Theorem The Intermediate Value Theorem also helps us solve polynomial and rational inequalities. Examples: 1 (x + 2) 2 (3x 2)(x 1) 3 0 Bekki George (UH) Math /28/18 32 / 37
33 Section The Intermediate Value Theorem 2 2x 8x 2 (x + 1) 2 0 Bekki George (UH) Math /28/18 33 / 37
34 Section The Intermediate Value Theorem 3 1 x x + 2 < 0 Bekki George (UH) Math /28/18 34 / 37
35 Section The Intermediate Value Theorem 4 4 x x Bekki George (UH) Math /28/18 35 / 37
36 Section The Intermediate Value Theorem Why did we just work these problems? Bekki George (UH) Math /28/18 36 / 37
37 Section The Intermediate Value Theorem Why did we just work these problems? These inequalities are able to be solved because of the Intermediate Value Theorem (IVT). The IVT basically states that if f(x) is continuous from x = a to x = b, then you must pass through all points (x = c ) plotted along the graph of f(x). Bekki George (UH) Math /28/18 36 / 37
38 Section The Intermediate Value Theorem Why did we just work these problems? These inequalities are able to be solved because of the Intermediate Value Theorem (IVT). The IVT basically states that if f(x) is continuous from x = a to x = b, then you must pass through all points (x = c ) plotted along the graph of f(x). Note: Functions with complex roots do not meet the requirements of the IVT. Why?? Bekki George (UH) Math /28/18 36 / 37
39 To Do Read Sections 1.4 and 1.5. Finish hw 1 Work on quizzes 1, 2 and 3. It helps to do the work problems right after the lesson. Post questions to the discussion board on CASA. Bekki George (UH) Math /28/18 37 / 37
Math Section Bekki George: 02/25/19. University of Houston. Bekki George (UH) Math /25/19 1 / 19
Math 1431 Section 12200 Bekki George: rageorge@central.uh.edu University of Houston 02/25/19 Bekki George (UH) Math 1431 02/25/19 1 / 19 Office Hours: Mondays 1-2pm, Tuesdays 2:45-3:30pm (also available
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