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1. What is 5^n=80n

thanx for ur replies
2. What is 5^n=80n

I've got a problem with this: 5^n=80n find n! I can't solve out this one. thanx for ur help, I'm not sure if it's the right place for this thread.
3. Integral equation

now I m learning calculus 2, I just want to know, cause I got that questions on my mind. Do you know where I can find web so I can learn about calculus more, especially cal 2. thanx Cronxeh
4. Integral of sqrt(x^3 -1) dx

thanx everyone

6. Integral of sqrt(x^3 -1) dx

I got this problem from someone by forum too. I thought it wasn't so difficult.. thanx for reply. but is the function really can be integrated?
7. Integral equation

I thought the same, it's what I assumed (I heard from my teacher) before but I'm not quite sure. By the way, what does "The series must also converge" mean? and I don't know about Differential Galois Theory. Thanx for your reply :smile:
8. Integral of sqrt(x^3 -1) dx

what's that? I don't know about it...
9. Integral equation

what does an equation need so that the equation can be integrated? not all of equation can be integarted right? I was quite confuse if it can be integrated or not whether I found a difficult integration. Thanx
10. Integral of sqrt(x^3 -1) dx

hm you may be right
11. Integral of sqrt(x^3 -1) dx

integral of sqrt(x^3 -1) dx. I have tries it with trigonometri subs, but I only found till integral of 2/3(sin^5/3 (tetha) / cos^2 (tetha) ) d(tetha)
12. Volume problem

yesterday I had thought it again and I think I have found it. but it's seems diffrent from yours. why does the integration to y? shouldn't it (4-y)? I assumed that the section is under z=4 and above z+y=4 inside x^2+y^2=4. p=3.14. I will check it again. thanx oh yes I got it now. you subtract...
13. Formulae derivation

hm do you mean where does 3 come from? in integration (calculus), we can find the formula by integration. for ball, find antiderivative of p f(x)^2 dx
14. Volume problem

problem: find volume bordered by cylinder x^2 + y^2 = 4 and y+z=4 and z=4. the answer is said to be 16p. but I couldn't find it. I found it in double integral part.so it must be solved with double integral. I tried with Jacobian tranformation. nut still couldn't solve it. I was confused...
15. Integration problem!

thanx. know i understand. it's only a simple subs. thx anyway.
16. Integration problem!

Dextercioby, I don't get what u wrote. in the 4th warning. the (2) would u tell me. thanx