Question

integrate this one please

Answer 1

integrate what?

Answer 2

\[\int\limits_{}^{} \frac{2xlnx}{\sqrt{x^{2}-9}} dx\]

Answer 3

with solution please. :)

Answer 4

start with integration by parts

Answer 5

how? let u= lnx and dV= (x^2 -9)^1/2?

Answer 6

why would dv be that?

Answer 7

i was just asking. :)

Answer 8

keep u as ln x
make dV = remaining function (entire)

Answer 9

oh.

Answer 10

i got \[lnx \sqrt{x^{2}-9} - \int\limits{\frac{\sqrt{x^{2} -9}}{x}} dx\]

how to integrate this part ↑

Answer 11

what happened to your 2

Answer 12

are u missing a 2 ?
and for 2nd integral, when you see x^2-a^2
you put
x=a sec u

Answer 13

oh wait. there should be 2 anywhere there,

Answer 14

so its trigonometric substitution?

Answer 15

yup, it will simplify the integration part.