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AQA A2 Mathematics MPC4 Core 4 - 9th June 2015 [Discussion & unofficial markscheme]

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Reply 860

matthew6665

Original post by saad97

I found it awful too, there were a couple of questions on there I'd never ever seen before like wtf? :angry:

Yeah they are *****.. If they make core 4 as hard as core 3 , then I'll probably have to go through clearing XD

Reply 861

the_googly

How do you know when to work out C in integration and when not to?

Reply 862

CD223

Original post by the_googly

How do you know when to work out C in integration and when not to?

It depends if they've given co-ordinates or a condition that follows the integral that enables you to substitute in numbers to work it out.

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Reply 863

the_googly

Original post by CD223

It depends if they've given co-ordinates or a condition that follows the integral that enables you to substitute in numbers to work it out.

Posted from TSR Mobile

what if you just sub in (0,0)

Reply 864

CD223

Original post by the_googly

what if you just sub in (0,0)

Well you can only do that if (0,0) is a valid point?

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Reply 865

UOE15

Could someone please explain the log rules used for june 2012 4b ? :smile:

Reply 866

the_googly

Original post by CD223

Well you can only do that if (0,0) is a valid point?

Posted from TSR Mobile

ah ok

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Reply 867

saad97

Original post by matthew6665

Yeah they are *****.. If they make core 4 as hard as core 3 , then I'll probably have to go through clearing XD

I'm already fearing that! :frown:

Reply 868

datpr0

Original post by saad97

I'm already fearing that! :frown:

I don't understand what all the fuss about that C3 paper is :/. What did everyone find so horrible?

Reply 869

student0042

Original post by datpr0

I don't understand what all the fuss about that C3 paper is :/. What did everyone find so horrible?

Me too, I found it fine.

Reply 870

Alex1004

Hi, could someone please explain to me how to do this question? I have no idea where to even start.

Reply 871

aoxa

Original post by UOE15

Could someone please explain the log rules used for june 2012 4b ? :smile:

First you need the inequality that Mr Browns investment > Mrs White investment. Then you log both sides - it doesn't matter which base, but I did it to base 10 because its less writing :tongue:

then you used the log law that log(xy) = log x + log y on both sides of the inequality. Then bring the power of T down on both sides log y^T = Tlog y, get the logs with T on one side of the inequality, the logs without of the other side, and then the log law log a - log b = log a/b T can now be taken out of one side as it a factor so you'll have T log(...) > log a/b divide both sides so you get T on its own, T > log(...)/log(a/b) put it in the calculator, and et voila.

Sorry if its a bit long winded/ confusing!

Reply 872

saad97

Original post by datpr0

I don't understand what all the fuss about that C3 paper is :/. What did everyone find so horrible?

I'm not making a big fuss about it, I'm just saying I messed up on the paper because firstly I made a few silly mistakes and secondly I wasn't taught a couple of things properly and they popped up which meant I dropped even more marks...

Reply 873

datpr0

Original post by saad97

, and I was referring to a general fuss. Hopefully C4 won't be too bad :wink:

Reply 874

UOE15

Original post by saad97

Don't worry I found it awful haha

Reply 875

saad97

Original post by datpr0

, and I was referring to a general fuss. Hopefully C4 won't be too bad :wink:

Sorry I thought it was directed at me haha. I personally won't keep my hopes too high after the exams I've sat so far this year :tongue:

Reply 876

saad97

Original post by UOE15

Don't worry I found it awful haha

Haha quite a few people did, I've just forgotten about it tbh, time to work hard for my other exams!

Reply 877

aoxa

Original post by Alex1004

Hi, could someone please explain to me how to do this question? I have no idea where to even start.

Draw a triangle and use soh cah toa on it. You have values of two of the sides, then use Pythagoras for the other side. The angle can then be worked out.

For pt b, you use the same method, but as it is obese, you have to do 180/pi - answer because using inverse trig to find the angle will only give you the acute angle.

Pt c is using the double angle formula from your other answers.

Reply 878

UOE15

Original post by aoxa

First you need the inequality that Mr Browns investment > Mrs White investment. Then you log both sides - it doesn't matter which base, but I did it to base 10 because its less writing :tongue:

thank you!

Reply 879

matthew6665

Original post by saad97

I'm already fearing that! :frown:

Last question on JUNE 2010 is solid... :s Differential equation , i did the first step to separate them to both sides, but how did they integrate dx/Root(x+1) .. :s-smilie: