2.2.4 An Overview of Limits Flashcards Preview

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Flashcards in 2.2.4 An Overview of Limits Deck (11)
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1
Q

An Overview of Limits

A
  • The limit is the range value that a function approaches as you get closer to a particular domain value.
  • An indeterminate form is a mathematically meaningless expression.
2
Q

note

A
  • This limit involves an unusual variable.
  • Remember to use direct substitution as a first step in evaluating limits. In this case, direct substitution produces the familiar indeterminate formof 0/0.
  • Proceed by factoring the numerator, which is a difference of two squares.
  • Use cancellation to simplify the limit expression and then apply direct substitution to arrive at the result.
  • The existence of limits can be demonstrated graphically. On the far left, the graph shows that near x= 7 the function is approaching the same value from both the left and the right. The limit exists and equals that value, even though the function takes on a different value at x= 7.
  • On the near left, the graph approaches different values on either side of x= 5. Since the two one-sided limits have different values, the limit of the function does not exist.
  • Here is an example of a function that is approaching very large values from the one side and very small values from the other. The limit for such a function does not exist.
3
Q

LetG(x)= x^2−4/x+2, x≠−2
k, x=−2
Find the value of k so that lim x→−2 G(x)=G(−2).

A

-4

4
Q

Classify all of the discontinuities of the function h(x)=f(g(x)) given f(x)=1/x−3 and g(x)=x^2+2.

A

x = −1 and x = 1; infinite discontinuities

5
Q

Given that lim x→0(sinx)^2/x=0, find the limit.

lim x→0 1−cosx/x

A

0

6
Q

Evaluate the limit limCOW→3

[4(COW)−12 / (COW)^2+(COW)−12].

A

4/7

7
Q

Does f (x) have a limit at x = −3?

A

No, the limit doesn’t exist.

8
Q

Evaluate the limit

limΔx→0 4(Δx+2)^2+5Δx−3/6Δx+1

A

13

9
Q
If f(x)=4x2−4xx+1,
evaluate the limit lim x→−1 f(x).
A

The limit does not exist.

10
Q

Given the limit lim x→2(2x+2)=6, what is the largest value of δ such that ε

A

.005

11
Q

Given the limit lim x→1 (4x+3)=7,what is the largest value of δ such that ε≤.01?

A

.0025

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