Can someone please help? I tried to post this and waited thirty minutes.... i just forgot how to evaluate a double integral. I can do a single no problem, but based on what my textbook is showing I am getting something wrong. I will post pictures of what I did and what they did and am hoping someone can help?

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chrisplusian · Answer

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chrisplusian · Answer

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chrisplusian · Answer

The first is what the book did, the second is what I did

anonymous · Answer

did you try watching the khan academy videos on it? he does step by step walkthroughs and is really quite good at explaining stuff, usually better than my teachers do since he proves it too: khanacademy.org and search for double integrals. he has about 6 complete walkthrough videos and then excercizes

chrisplusian · Answer

I have watched countless hours of khan academy, and although Khan academy
 is great it is not a good place to find a simple answer to something you once knew but have forgotten.

chrisplusian · Answer

Once upon a time this site was really helpful, but now I have tried it two or three times in the last couple years and it is always the same.... hours on here and no answer

anonymous · Answer

hm.. i don't know.. i am 38 and forgot most of algebra, and just retaught it all to myself by using khan academy and aleks. I found it invaluable, considering it had been well over 20 years! I wish I could help you, I have not taught myself back up past trig yet. :)