Question

isn't the integral of dx / [x (7x^2 - 5)^(1/2) ] = 1/a arcsec u/a??

Answer 1

I ask because I applied it and I got it wrong.

Answer 2

looks you forgot to put the absolute value bars

Answer 3

maybe

Answer 4

my solution

Answer 5

forgot to square the a=5 and the integral signs. Sorry, was a bit hasty making it.

Answer 6

you can try this substitution:
\[\large \sqrt {7{x^2} - 5} = \sqrt 7 x + t\]
where t is the new variable of integration

Answer 7

Ok, thanks!