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4. Limits of Functions Sept 12.notebook
1
September 12, 2016
1.4 Limit of a Function
The which is read, the "limit" of function as approaches (in neigbourhood) .Note: The limit exists at if and only if, function approaches the same yvalue from both the left and right sides of . (Note: function does NOT have to necessarily exist at to have a limit at .
Therefore:
exists when
4. Limits of Functions Sept 12.notebook
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September 12, 2016
Ex 1) Determine the
A) Graphically
8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8
54321
12345678910
x
y
C) Algebraically (Direct Substitution)
B) Analyzing Table of Values
x 4 3 2.5 2.1 2.01 2 1.99 1.9 1.5 1 0
13 6 3.25 1.41 1.0401 1 0.9601 0.61 0.75 2 3
4. Limits of Functions Sept 12.notebook
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September 12, 2016
Caution: Direct Substitution works when function is continuous through out its domain.
Ex 2) Determine
10 8 6 4 2 0 2 4 6 8 10
12111098765432
123456789101112
x
yA) Graphically
Recall: Sketch Rational Function
B) Analyzing Table of Valuesx 4 4.5 4.9 4.99 5 5.01 5.1 5.5 6
f(x) 7 16 88 898 #DIV/0! 902 92 20 11
C) Algebraically/SubstitutionOriginal Function
4. Limits of Functions Sept 12.notebook
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September 12, 2016
Ex 3) Determine
A) Graphically
10 8 6 4 2 0 2 4 6 8 10
12111098765432
123456789101112
x
y
B) Analyzing Table of Values
x 7 6 5.5 5.1 5.01 5 4.99 4.9 4.5 4 3
f(x)
Simplified Version of FunctionC) Algebraically/Substitution
Note: Limits exist at holes even though function doesn't exist there. Must sub into simplified version to determine limit!! (Location of Hole)
4. Limits of Functions Sept 12.notebook
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September 12, 2016
Example 4: For the piecewise function
determine ififif
6 5 4 3 2 1 0 1 2 3 4 5 6
6
5
4
3
2
1
1
2
3
4
5
6
x
y