1. anonymous

|dw:1358980721038:dw|

int by sub let u=x+1 ---> du = ...

3. anonymous

then du = 1..? i'll try doing it myself, and come back again if i cant get any farther.

it should du=dx so, it can be int [0,3] (u^1/2) du = ...

5. anonymous

|dw:1358981552574:dw| ?

6. anonymous

oh wait, nevermindd i did something wrong there.

7. anonymous

i got 13/3, but it says that the answer is -1/4...

8. anonymous

oh WAIT. no sorry it says the answer is 14/3.

do u know, what's the integrate of u^1/2 du ?

10. anonymous

yes. it is $\frac{ 2u ^{3/2} }{ 3 }$

yes, correct.. and after that u have to subtitute back u=(x+1). right ?

12. anonymous

|dw:1358982043647:dw|

|dw:1358982171324:dw|

14. anonymous

ahh I made a silly mistake. thank you !!! :D