Originally Posted by

**VkL** How do you do this integral without a table?

Integral [ Sqrt(4x^2 + 20)]

I got it down to

2* integral [ sqrt(x^2 + 5) ]

Now I can use the table and get a answer that has a natural logarithm in it, But how do you do it without a table?? I know that's a stupid question to ask, But this does not look complicated to do!!! I just don't know where to start. U-sub does not work! ...by parts? I can't see how that would work..I was maybe thinking Switching it to polar coordinates?...Or maybe a trig substitution?

Any help would be much appreciated!