# 3 Integral questions

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• Apr 1st 2007, 04:52 PM
xcelxp
3 Integral questions
Hello,
My homework is due very soon and Ive been attempting the problems but to be completly honest I have not put in the time and dont understand the basics. I cant afford to miss a homework and would greatly appreciate some help. Please understand that I will not just take your answers and never look at the problem again. I am looking to learn from your help. Thanks in advance.

Evaluate the indefinite integral.

Evaluate the indefinite integral.

Evaluate the indefinite integral.

http://hosted2.webwork.rochester.edu...b7bf08af01.png
• Apr 1st 2007, 04:58 PM
Jhevon
Quote:

Originally Posted by xcelxp
Hello,
My homework is due very soon and Ive been attempting the problems but to be completly honest I have not put in the time and dont understand the basics. I cant afford to miss a homework and would greatly appreciate some help. Please understand that I will not just take your answers and never look at the problem again. I am looking to learn from your help. Thanks in advance.

Evaluate the indefinite integral.

Here
• Apr 1st 2007, 05:03 PM
Jhevon
Quote:

Originally Posted by xcelxp

Evaluate the indefinite integral.

Here
• Apr 1st 2007, 05:03 PM
xcelxp
Thank you very much, every bit helps!
• Apr 1st 2007, 05:04 PM
Jhevon
I'm rushing through these and am doing things while i'm doing it, so wait until i recheck them for errors before you copy them down. or better yet, you can check
• Apr 1st 2007, 05:05 PM
xcelxp
I just checked the 2nd one it and didnt work out.
• Apr 1st 2007, 05:05 PM
Jhevon
try the last one by yourself, if you get it wrong, i'll post the solution.

Hint: you have to do it by substituion. use u=x^5 + 1
• Apr 1st 2007, 05:06 PM
xcelxp
sounds good, Ill post my work here. Give me a couple mins.
• Apr 1st 2007, 05:12 PM
Jhevon
Quote:

Originally Posted by xcelxp
I just checked the 2nd one it and didnt work out.

there's nothing wrong with the second one, i checked myself. if you differentiate 5ln(ln(4x)) you get back 5/xln(4x). try it
• Apr 1st 2007, 05:14 PM
xcelxp
I get this far...then im stuck

u=x^5+1
Thus,
u'=5x^4

then
int 1/u^2 du

then what
• Apr 1st 2007, 05:15 PM
xcelxp
The answer above is NOT correct.

• Apr 1st 2007, 05:15 PM
Jhevon
Quote:

Originally Posted by xcelxp
I get this far...then im stuck

u=x^5+1
Thus,
u'=5x^4

then
int 1/u^2 du

then what

then you integrate that

remember, 1/u^2 = u^-2, use the power rule

you must be really tired huh?:p
• Apr 1st 2007, 05:16 PM
xcelxp
I had a 3.4 I swear :)
• Apr 1st 2007, 05:17 PM
Jhevon
Quote:

Originally Posted by xcelxp
The answer above is NOT correct.

what are you inputting the answer into?

i assure you, that answer is not wrong. i've checked it myself, as well as checked it using maple AND The Integrator

there is no way its wrong
• Apr 1st 2007, 05:24 PM
xcelxp
I am entering this as my answer for the second one 5ln(ln(4x))

and it is telling me the answer is incorrect
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