anonymous 4 years ago integrate[3x*squaroot[x^2+4]]

1. anonymous

|dw:1327730857669:dw|

2. anonymous

like that?

3. anonymous

yes.. im stuck cuz x^2+4 cant be factored =(

4. TuringTest

$u=x^2+4\to du=2xdx$$\frac3 2\int \sqrt u du$

5. anonymous

what happen to the extra x? u just left that out.,...

6. TuringTest

no it is part of du

7. anonymous

du=2x,, there is 3x?

8. TuringTest

yes because there was a 3 in the beginning I pulled that out then multiplied by 2/2 to get my expression.

9. anonymous

oh geeze, i kept thinking 3x is sticking together, thanks, now it makes sense =)

10. TuringTest

anytime :)