QUOTE(Josh @ May 14 2007, 12:06 PM)

please could you explain question 10 testB. ive been trying it for the past 20 minutes and can't get it to work
I'm scared for tomorrow now
Don't be too scared - logs is only a small bit of the course, and it just takes work to get on top of it.
As I explained above, after subbing in the point you get

. Here's how to get the answer:

So the answer is
B.
(mikey, it went wrong for you when you said "take log on both sides", because you still had the 3 on the RHS, so

)
Question 6 is a (fairly difficult) completing the square:

Here's my working:

So the "p" is 5; answer
C.
Notice that I took out the negative first of all, so that I could do the usual completing the square with a

, since that's easier.
Going onto the second line is really the "completing the square" step - to get

we use

(the -3 is "half the x-coefficient"). But that bracket is

- so it's giving us an extra 9, which we then take off in our working.
So all I've done going from line 1 to line 2 is replace

with

since those are the same. After that, it's just a matter of tidying up.