You try to find log (0) which is
It's a simple fraction either you use the formula for fractions with terms above and under the fraction, or you split it up into a multiplication between the upper terms and the rest of the fraction. And you calculate them separately. Both ways work rather good. Don't let you be confused by the a,b,c and d. Look at them if they were simple numbers. All you need to do is watch out for the x.
3. It's a simple polynom. Derivate term by term. That's it.