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Last minute c2 questions thread!!

Hey guys! :wavey:

With only a day or two today before the C2 exams (across multiple boards), we have decided to make this thread for your last minute revision that you need to secure your wanted grade :smile:

If you have any C2 questions, please post them here and someone will be able to help you out! :smile:

Feel free to tag me in any questions you post so I can help as soon as possible if I'm around

After-Exam Threads

This thread will get very busy so if you ask a question and it isn't answered in 20 minutes then please start a new thread in the maths forum with your question.
(edited 6 years ago)

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Please try not to post a question without working out unless you are completely stuck.

If you are completely stuck then first try to find a similar example, or in your post throw out your ideas.
Original post by MKaur18
could you help me on how they got this:
(x3/2)2 = x3

is it because 1.5 times 2 = 3... :/ omg i'm legit so tired..


Yes it's because 1.5 times 2 = 3

But mainly because the two cancels with the 2 on the denominator of the fraction, since you have to multiply them together.
:scream:
2017-05-22 (3).png

The mark scheme makes no sense to me for Question 13 b)

I thought the 1/2 to the power of x could be 2 to the power of -x. please help
Original post by wantodothebest
2017-05-22 (3).png

The mark scheme makes no sense to me for Question 13 b)

I thought the 1/2 to the power of x could be 2 to the power of -x. please help

dude,
13b is a hidden quadratic, maybe substituting that u=2x u = 2^x would be advisable
Reply 6
Original post by Whitefeather
Hey,
Any idea what areas/volumes we should learn for our exam? For differentiation.
Please help!

What do you mean by this
This thread is exactly what I need to be part of! :smile:
this thread is going to be a C2 style Mecca soon,
many questions etc
Original post by ThatsAGoodOne349
dude,
13b is a hidden quadratic, maybe substituting that u=2x u = 2^x would be advisable


It says show that, not solve.

How to I get from 2^x + 1 = (1/2)^x to the quadratic?

The mark scheme doesnt show anything to do with a quadratic
Original post by wantodothebest
It says show that, not solve.

How to I get from 2^x + 1 = (1/2)^x to the quadratic?

The mark scheme doesnt show anything to do with a quadratic


12=21\frac{1}{2}=2^{-1}

Apply an index law

Then mult through by 2x2^x.
Original post by wantodothebest
It says show that, not solve.

How to I get from 2^x + 1 = (1/2)^x to the quadratic?

The mark scheme doesnt show anything to do with a quadratic


2x+1=(12)x2^x +1 = (\frac{1}{2})^x

You just contradicted yourself...
2017-05-22 (4).png
Original post by RDKGames
12=21\frac{1}{2}=2^{-1}

Apply an index law

Then mult through by 2x2^x.


But it you mutliple by 2 to the power x, why doesn't the one become 2 to the power x. Mark scheme confusing me
Original post by ThatsAGoodOne349
2x+1=(12)x2^x +1 = (\frac{1}{2})^x

You just contradicted yourself...


Sorry! Just panicking a bit because Im usually good at logs and this is a logs worksheet
Original post by wantodothebest


But it you mutliple by 2 to the power x, why doesn't the one become 2 to the power x. Mark scheme confusing me


Because 12x=2x1\cdot 2^x = 2^x ...
haha I remember doing C2 in 2015, back when life was easy
Original post by RDKGames
Because 12x=2x1\cdot 2^x = 2^x ...


Oh sorry! yeah I just tried it again, thank you!

I was being silly
Can I get a hint on how to start this?

Untitled.png
Reply 18
can someone pls give me the answers to these questions
http://www.m4ths.com/uploads/3/2/7/4/3274186/___c2_logs_and_exponentials.pdf
Reply 19
Could someone pls tell me all of the area/volume/cross section formula for every shape included c2

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