mlddmlnog
PLEASE HELP. :(



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mlddmlnog
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dw:1358980721038:dw

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

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

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

mlddmlnog
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dw:1358981552574:dw ?

mlddmlnog
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oh wait, nevermindd i did something wrong there.

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

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

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

mlddmlnog
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yes. it is \[\frac{ 2u ^{3/2} }{ 3 }\]

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

mlddmlnog
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dw:1358982043647:dw

RadEn
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dw:1358982171324:dw

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

RadEn
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very welcome ")