question: integral of [(3-ln2x)^3]/2x(adsbygoogle = window.adsbygoogle || []).push({});

my workings:

I let u = 3-ln2x

then du= -2/x dx

so -1/2du = 1/x dx

this leaves me with -(1/2)*integral of u^3/2 du

I take the bottom 2 out to get -(1/2)*(1/2) * integral of u^3 du

which is -1/4 * (u^4)/4

then I sub u in to get

-1/4 *(3-ln2x)/4

Which is -1/16 * (3-ln2x)

On my test I only got 8/10 for this question and When I plug this example into Wolfram it gives some wacky answer.

Can someone tell me if I'm right? Thanks

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# Homework Help: Easy u sub

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