Title: Continuity and One-Sided Limits
1Continuity and One-Sided Limits
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4Don't let this Happen to you!
5Intuitive Look at Continuity
- A function withoutbreaks orjumps
- The graph can bedrawn without lifting the pencil
?
6Continuity at a Point
- A function can be discontinuous at a point
- A hole in the function and the function not
defined at that point - A hole in the function, but the function is
defined at that point
7Continuity at a Point
- A function can be discontinuous at a point
- The function jumps to a different value at a
point - The function goes to infinity at one or both
sides of the point, known as a pole
8Definition of Continuity at a Point
- A function is continuous at a point x c if the
following three conditions are met - f(c) is defined
-
-
- For this link, determine which of the conditions
is violated in the examples of discontinuity
x c
9"Removing" the Discontinuity
- A discontinuity at c is called removable if
- If the function can be made continuous by
- defining the function at x c
- or redefining the function at x c
- Go back to this link, determine which (if any) of
the discontinuities can be removed
10Which of These is Dis/Continuous?
Are any removable?
11Continuity Theorem
- A function will be continuous at any number x
c for which f(c) is defined, when - f(x) is a polynomial
- f(x) is a power function
- f(x) is a rational function
- f(x) is a trigonometric function
- f(x) is an inverse trigonometric function
12Properties of Continuous Functions
- If f and g are functions, continuous at x
cThen - is continuous (where s is a
constant) - f(x) g(x) is continuous
- is continuous
- is continuous
- f(g(x)) is continuous
13One Sided Continuity
- A function is continuous from the right at a
point x a if and only if - A function is continuous from the left at a point
x b if and only if
a
b
14Continuity on an Interval
- The function f is said to be continuous on an
open interval (a, b) if - It is continuous at each number/point of the
interval - It is said to be continuous on a closed interval
a, b if - It is continuous at each number/point of the
interval and - It is continuous from the right at a and
continuous from the left at b
15Continuity on an Interval
- On what intervals are the following functions
continuous?
16Intermediate Value Theorem
- Given function f(x)
- Continuous on closed interval a, b
- And L is a number strictly between f(a) and f(b)
- Then there exists at least one number c on the
open interval (a, b) such that f(c) L
f(b)
L
f(a)
b
a
17Locating Roots with Intermediate Value Theorem
- Given f(a) and f(b) have opposite sign
- One negative, the other positive
- Then there must be a root between a and b
a
Try exercises 88, 90, and 92 pg 100
b
18Assignment
- Lesson 2.4A
- Page 98
- Exercises 1 49 odd
- Lesson 2.4B
- Page 99
- Exercises 51 75, 85 105 odd