Math Is Fun Forum

Identity

Member

Registered: 2007-04-18

Posts: 934

an elementary integral?

Stewart Calculus said
"You may rest assured that the integrals in the following exercises are all elementary functions."

I have tried solving it but I keep coming to dead ends.

My calculator couldn't solve it, so somehow I doubt it's elementary, can someone please tell me?

Last edited by Identity (2009-12-14 19:55:00)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: an elementary integral?

Hi Identity;

Make the sub. u = x^4 + 2x^2 + 4x and everything will go fine. Or you can remember the general rule:

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Identity

Member

Registered: 2007-04-18

Posts: 934

Re: an elementary integral?

Gah! Of course! I made an arithmetic error which made it unsolvable. thanks bobbym