- #1
arenaninja
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Homework Statement
Hey all. I'm having issues with a few Diff. Eq. problems. I think I'm screwing up at the point of u-substitution, but I do not know for sure.
Homework Equations
I'm evaluating: (x2 + x3)*integral (x4/(x4+2x5+x6)
The Attempt at a Solution
I eliminate x4 inside the integral and evaluate:
x*(x+1)*integral(dx/(x+1)2)
= x2*(x+1)/-(x+1). Cancel out (x+1), and my answer is
= -x2.
However, the back of the book says the answer should be x2 (positive). Can anyone point out as to what I'm doing wrong? I've gotten a few of these wrong, usually because they are in the denominator and I do u-substitution.
P.S.: If anyone has a link on how to use Latex Reference, it'd be greatly appreciated. I tried a few things and could not get it to work, for the life of me.
Latex text: [tex]y_2[/tex]
Many thanks.
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