damn teacher who doesn't answer questions.....

Feb 11, 2007 19:41

So my teacher thought it would fun to go through a whole chapter on integrals while i was down with bronchitis.  uhh.. could someone help me with these problems?

a) Integral of  12x^2/(2x^3+5)^(5/2) dx  using substitution

b) Find 4xe^2x dx using integration by parts
        I tried doing this one going along with the example in the book, and I got...
 (4xe^2x)/(2) - (e^2x)/(4) + C

c)Find the value of 1/x^3dx from 3 to infinity...

Followed the example and got 1/36?

So yeah, any help would be much appreciated!  I am trying to find resources on theinternet to use, but blah... not helping.  Stupi
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