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Integration By Substitution Help Please... Watch

1. Okay, I know u=3x^2+5 and du/dx=6x and dx/du=1/6x

How do I cancel out the 2x in the question? I cancelled 1/6x divided by 2x which equals 1/3x ? then what next? :|
2. What you've done is say that ... what's wrong with that? [Something is wrong with it.]

Say we had . Does ?

So what might you do to make it right?
3. (Original post by nuodai)
What you've done is say that ... what's wrong with that? [Something is wrong with it.]

Say we had . Does ?

So what might you do to make it right?
is it 6x divided by 2x which will give 3
4. (Original post by Nkhan)
is it 6x divided by 2x which will give 3
You're dividing 2x by 6x, not the other way round.

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