jennychan12
Am I doing something wrong? See below.
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jennychan12
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\[\int\limits (x \sqrt{x+2})dx\]
jennychan12
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u = x+2 ---> x = u-2
so
\[\int\limits (u-2)u^{\frac{ 1 }{ 2 }} du\]
\[\int\limits u^{\frac{ 3 }{ 2 }} - 2u^{\frac{ 1 }{ 2 }}\]
am i correct so far? if i am i can do the rest
jennychan12
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oops. forgot the du on the last part
jennychan12
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If it is it'd be
\[F(u) = \frac{ 2 }{ 5 } u^{\frac{ 5 }{ 2 }} -\frac{ 4 }{ 3 }u^{\frac{ 3 }{ 2 }}\]
and I'd just plug in the u's.
shining
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true
jennychan12
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oops forgot the +C
I checked the answer and it'd partially correct.
i got to the 2/5u.....
i don't understand what they did after.
slaaibak
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they just factorise
jennychan12
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ohhh ok lemme try that and see if i get it right..
:/
precal
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at the end they sub u back in
jennychan12
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-_- that just makes more work
oh well i got the answer, thanks.
slaaibak
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cool