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Section 5.1 - Limits
No Calculator
Limit – the limit tells THE INTENDED HEIGHT of f(x) as x
approaches a particular value ‘c’ from BOTH directions.
lim f x L
x c
lim f x 2
x 0
lim f x DNE
x 2
lim f x 0
x 1
lim f x DNE
x 1
lim f x DNE
x 2
New Graph…try these five limits
lim f x DNE
x 2
lim f x 0
x 1
lim f x 2
x 0
lim f x DNE
x 1
lim f x DNE
x 2
lim f x 1 lim f x 1
x 2 x 2
lim f x lim f x
x 1 x 1
lim f x 1 lim f x 1
x 0 x 0
lim f x 2 lim f x 2
x 1 x 1
lim f x 2 lim f x 3
x 2 x 2
lim f x 1 lim f x 1
lim f x DNE lim f x 1 x 3 x 3
x 5 x 5
lim f x 1 lim f x 1
lim f x 2 lim f x 2 x4 x4
x 4 x 4
lim f x 1 lim f x DNE
lim f x lim f x x 5 x 5
x 3 x 3
Evaluation by Substitution
lim 5x 5 4 20
x4
lim x 3 3 3 36
2 2
x 3
lim 3x 1 3 1 1 4
x 1
lim 10 3x 10 3 12 26
x 12
lim x 2x 4x 8 2 2 2 4 2 8 32
x 2
3 2 3 2
4 4
lim
x 5 x 7
2
57
x2 2 2 4 1
lim 2
x 2 x 5x 6
2 5 2 6 20 5
2
x2 x2 1 1 1
lim 2 lim
x 2 x 5x 6 x 2 x 3 x 2
x 3 23 5
x3 x3 1 1 1
lim lim lim
x 3 x 2 4x 3 x 3 x 1 x 3 x 3 x 1 3 1 2
lim
x 2 3x 2
lim
x 1 x 2 x 2 1
lim
x 1 x 2 x 2 x 1 x 1 x 2 x 1 x 2 3
x 5 x 5 1 1
lim 2 lim lim
x 5 x 25 x 5 x 5 x 5 x 5 x 5 10
x 2 x 2 1 1
lim lim lim
x4 x4 x 4
x 2 x 2 x 4
x 2 4
x x 1
lim 1
1 x x 1
x 1
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