Question

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

Answer 1

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

Answer 2

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

Answer 3

Not really I get extremely lost with integrals in general

Answer 4

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*