Mastering Integrals: Solving the Anti-Derivative of 7x^-1 with Ease

  • Context: High School 
  • Thread starter Thread starter Hygelac
  • Start date Start date
  • Tags Tags
    Integral
Click For Summary

Discussion Overview

The discussion revolves around finding the anti-derivative of the function 7x-1. Participants explore various approaches to solving this integral, including references to the fundamental theorem of calculus and the general formula for anti-derivatives.

Discussion Character

  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant initially expresses confusion about finding the anti-derivative of 7x-1.
  • Another participant suggests that the anti-derivative is 7ln(x) + C.
  • A different participant presents the general formula for anti-derivatives, \(\int x^n dx = \frac{x^{n+1}}{n+1} + C\), as a potential approach.
  • One participant argues that applying the general formula in this case is not valid.
  • A participant acknowledges a misunderstanding of the question and mentions that the fundamental theorem of calculus could be applicable.
  • Another participant points out that setting n = -1 in the general formula leads to division by zero, which is problematic.
  • A participant references the integral of 1/u, stating it equals ln|u| + C, but this is also questioned in the context of the original problem.
  • There is a light-hearted acknowledgment of the confusion and the importance of reading the question carefully.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correct approach to finding the anti-derivative of 7x-1, and multiple competing views remain regarding the validity of different methods.

Contextual Notes

There are unresolved issues regarding the application of the general anti-derivative formula when n = -1, as well as the implications of using the fundamental theorem of calculus in this context.

Hygelac
Messages
13
Reaction score
0
THis one just seems weird, I know it should be easy but for some reason I am having trouble with it :(

What is the anti-derivative of 7x^-1 ?
 
Physics news on Phys.org
7ln(x) + C.
 
[tex]\int x^ndx=\frac{x^{n+1}}{n+1}+C[/tex]
 
Using that won't work in this case.
 
i read the q. wrong :P

but sure it works using the fundamental theorem of calculus
 
It still doesn't work. If you set n = -1, you'll be dividing by zero...
 
[tex]\int \frac{1}{u}\,du=\ln|{u}|+C[/tex]
 
Muzza said:
It still doesn't work. If you set n = -1, you'll be dividing by zero...



good point

SEE KIDS what can happen if you don't read the whole question?

*blush* :-p
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 27 ·
Replies
27
Views
4K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 12 ·
Replies
12
Views
3K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 49 ·
2
Replies
49
Views
9K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 15 ·
Replies
15
Views
5K
  • · Replies 4 ·
Replies
4
Views
7K