Solving Homework: Can You Find the Right Answer?

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Homework Statement


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Homework Equations


The Attempt at a Solution


The answer is 16, but I get 12 only

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The integrand becomes u^2. one 'u' from the xdx and the other from the original substitution.
 
Oster said:
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.
 
lol. happens to me a lot.