Question

Time for integration: x*sqrt(x^2 + 9)

Answer 1

You would just let u = x^2 + 9
u = x^2 + 9, so du = 2xdx and dx = du/2x

Answer 2

\[\int\limits_{}^{}x \sqrt{x^{2}+9} dx\]

Answer 3

Does the u-substitution I mentioned make sense?

Answer 4

thats where i started and then it went off the rails...i'll try again...brb

Answer 5

Alrighty.

Answer 6

argh I was doing it right and then chickened out....and with confidence 2/3 * 1/2 will get to 1/3 which is in the answer

thanks

Answer 7

Good job, np :3