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## mlddmlnog 2 years ago PLEASE HELP. :(

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1. mlddmlnog

|dw:1358980721038:dw|

2. RadEn

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

3. mlddmlnog

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

4. RadEn

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

5. mlddmlnog

|dw:1358981552574:dw| ?

6. mlddmlnog

oh wait, nevermindd i did something wrong there.

7. mlddmlnog

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

8. mlddmlnog

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

9. RadEn

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

10. mlddmlnog

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

11. RadEn

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

12. mlddmlnog

|dw:1358982043647:dw|

13. RadEn

|dw:1358982171324:dw|

14. mlddmlnog

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

15. RadEn

very welcome ")

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