First, I like to mention. Questions on SAT do not EVEN come close to the difficulty you are posting. I think you accidently brought yourself a book called AIME (that is a math competition) and thought it said SAT. But anywats if you can do these tough problems you will kill the SAT math section.

You did an excellent job factoring.

Now you set each one equal to zero,

Now, by definition of logarithms,

.

(Note the meaning of is the same as [tex]\ln ).

For the second part you have,

Now you solve it through arc-tangent.