What Happens to ln(x^2 - 9) as x Approaches 3 from the Right?

  • Thread starter Thread starter JFerra
  • Start date Start date
  • Tags Tags
    Infinite Limit
Click For Summary
SUMMARY

The limit of ln(x^2 - 9) as x approaches 3 from the right is negative infinity. This occurs because as x approaches 3, the expression x^2 - 9 approaches 0, leading to the logarithm of a negative number, which is undefined. The key to understanding this limit lies in recognizing that ln(ab) = ln(a) + ln(b) can be applied, and that x^2 - 9 can be factored into (x - 3)(x + 3). Thus, the limit diverges to negative infinity as x approaches 3 from the right.

PREREQUISITES
  • Understanding of logarithmic functions, specifically ln(x).
  • Knowledge of limits in calculus.
  • Ability to factor quadratic expressions.
  • Familiarity with the concept of approaching values in limits.
NEXT STEPS
  • Study the properties of logarithmic functions, focusing on ln(ab) = ln(a) + ln(b).
  • Explore the concept of limits in calculus, particularly one-sided limits.
  • Practice factoring quadratic expressions to enhance algebra skills.
  • Learn about the behavior of logarithmic functions near their asymptotes.
USEFUL FOR

Students studying calculus, particularly those focusing on limits and logarithmic functions, as well as educators seeking to explain these concepts effectively.

JFerra
Messages
1
Reaction score
0
Determine the infinite limit:

lim ln (x^2 - 9)
x -> 3^+

Don't understand how the answer is negative infinity.

Thanks for the help
 
Physics news on Phys.org
ln(ab) = ln(a) + ln(b).

That is what you need to understand your limit.

Note that x^2 -9 can be factored.
 

Similar threads

Replies
2
Views
1K
Replies
1
Views
1K
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
3
Views
1K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 15 ·
Replies
15
Views
2K
  • · Replies 4 ·
Replies
4
Views
1K