Double integral

  • Thread starter athrun200
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  • #1
277
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Homework Statement


attachment.php?attachmentid=37128&stc=1&d=1310465399.jpg



Homework Equations





The Attempt at a Solution


The answer is 16, but I get 12 only

attachment.php?attachmentid=37129&stc=1&d=1310465399.jpg
 

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Answers and Replies

  • #2
85
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The integrand becomes u^2. one 'u' from the xdx and the other from the original substitution.
 
  • #3
277
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The integrand becomes u^2. one 'u' from the xdx and the other from the original substitution.

Oh my god. How come I can't even notice such a silly mistake.
 
  • #4
85
0
lol. happens to me a lot.
 

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