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# Official Edexcel C3 Discussion Thread watch

1. Phew, got scared for a second

I'm actually feeling a bit nervous now...I'm under a lot of pressure to do very well
2. (Original post by Superman_Jr)
The solomon papers actually get harder? I swear paper B was the hardest out of them all.
Only difficult question there was the one that asks Sin5x + Sinx. What part did you get stuck on?
3. in some iteration questions where you have to find the root and you just keep going till it converges.... what does this mean
4. can anyone help me with this. I am terrible at logs.

solve:
10^(x-2)=2^(x+2)
I would think of taking logs?
so..
(x-2)10=(x+2)2?
then what would i do?

xxxx
5. Good luck everyone Those of you who have to get A* for your offers, don't put too much pressure on yourself.. just do your best
6. (Original post by uer23)
Where are you taking your exam ?
kenya
(Original post by milliondollarcorpse)
WTF. Please tell me it's an afternoon exam
exam in an hour.....i am GMT+3
7. (Original post by milliondollarcorpse)
Phew, got scared for a second

I'm actually feeling a bit nervous now...I'm under a lot of pressure to do very well
sorry for that. you should have checked my location!!
8. how do you draw this graph: y=ln(modulus of 4x-12)
9. (Original post by kosy91)
kenya

exam in an hour.....i am GMT+3
Oh right, good luck.
10. (Original post by Smile-Like-You-Mean-It)
can anyone help me with this. I am terrible at logs.

solve:
10^(x-2)=2^(x+2)
I would think of taking logs?
so..
(x-2)10=(x+2)2?
then what would i do?

xxxx
Take ln of both sides:

ln10^(x-2) = ln2^(x+2)

Now bring the power down, rules of logs:

(x-2)ln10=(x+2)ln2

Multiply out brackets:

xln10 - 2ln10 = xln2 + 2ln2

collect x terms:

xln10 - xln2 = 2ln2 + 2ln10

rules of logs to simplify:

xln(10/2) = 2ln(20) <== (2*10)

x= 2ln20/ln5
11. (Original post by kosy91)
how do you draw this graph: y=ln(modulus of 4x-12)
Draw the graph of ln(4x-12) using the standard transformations you know from C1, then the part x≥0 you reflect in the y-axis.
12. Someone tell me how logs divide? Is it basically taking it to a minus power? If so, will I ever need to do it?
13. awwww everybody seems to be well-prepared except me Just did 1 paper yesterday for revision Wish all luck^^
14. (Original post by Merk that Sike of a Mike)
Take ln of both sides:

ln10^(x-2) = ln2^(x+2)

Now bring the power down, rules of logs:

(x-2)ln10=(x+2)ln2

Multiply out brackets:

xln10 - 2ln10 = xln2 + 2ln2

collect x terms:

xln10 - xln2 = 2ln2 + 2ln10

rules of logs to simplify:

xln(10/2) = 2ln(20) <== (2*10)

x= 2ln20/ln5
15. good luck everyone .
16. Was it Philip Glass Piano Metamorphises? youtube em....
18. (Original post by uer23)
Draw the graph of ln(4x-12) using the standard transformations you know from C1, then the part x≥0 you reflect in the y-axis.
It doesn't work like that. If it were the modulus of x only, then yes that would be correct.

Edit: Ooh just realised, I think you draw the standard graph, then reflect it in the line x=3, which is the asymptote.
19. Eeee good luck guys!
Just got 62/75 for Jan 2009..considering I only want a B, thats good!
20. Guys any tips on curve sketching and finding ranges and domains ?

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