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 June 23rd, 2015, 06:50 AM #1 Newbie   Joined: Jun 2015 From: Toledo Posts: 2 Thanks: 0 Indefinite Integral help Hi everyone. I am stuck on this problem. Evaluate the indefinite integral: ∫ (x^3+6+((5)/(x^2+1)) dx I keep getting: (1)/(4)x^(4)+6x+11arctan(x) which is wrong. Can anyone enlighten me? Thank you! Last edited by skipjack; June 23rd, 2015 at 07:16 AM.
 June 23rd, 2015, 07:15 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,968 Thanks: 2217 How did you get "11"?
 July 16th, 2015, 03:55 AM #3 Newbie   Joined: May 2015 From: Nigeria Posts: 6 Thanks: 0 It's simple: first integrate ∫5/(x^2+1)dx which is 5arctanx. thus ∫x^3+6+{5/(x^2+1)= (x^4)/4+6x+5arctanx+k Last edited by skipjack; July 16th, 2015 at 08:50 AM.
July 16th, 2015, 08:52 AM   #4
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Quote:
 Originally Posted by tippeffect5 Evaluate the indefinite integral: ∫ (x^3+6+((5)/(x^2+1)) dx
You can't do that, as the parentheses don't balance. What integral did you intend?

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