Integral Question, can't get correct answer...picture attached!

Question

anonymous · Answer

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psymon · Answer

Make u ln(9t). It should work out just fine if you do the derivative properly.

psymon · Answer

Do you know about u-substitution and derivatives of ln?

anonymous · Answer

Not really I get extremely lost with integrals in general

psymon · Answer

Ah. Well, the idea is you have an extra variable in your integral that doesnt just disappear. When this occurs, you have to do u-substitution. What this means is that somewhere in your integral is a part that you can take the derivative of, solve for dx, and eventually cancel out the extra variable. Ill show an example *draws*

psymon · Answer

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