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

I'm starting to prepare now, but will do more over the summer.




I just said max when N = 250, which in the mark scheme gives 2 marks instead of differentiating it. I understand it better that way.

Hey, how's prep going for that A*!!!!?

I was gonna ask a question...
I don't know if you've done the june 2014 c3 paper but i really got caught out by that inverse question for the quadratic.. im still bamboozled by what the thought process is to do it... I just know there is gonna be something like that again in the exam this year

how did you calculate that max is 250 without differentiating it?

stuck on question 1

Posted from TSR Mobile

stuck on question 1

Posted from TSR Mobile

How did you do B?


Posted from TSR Mobile

correct?


Posted from TSR Mobile

stuck on question 3b now..

Posted from TSR Mobile

stuck on question 3b now.

Don't you just integrate the partial fractions you have found in part a with respect to x and then integrate 1/4y with respect to y and them rearrange to get y=f(x)

I'm just puzzled why you set it to equal zero. Surely that just implies the lines are perpendicular?


Posted from TSR Mobile

Don't you just integrate the partial fractions you have found in part a with respect to x and then integrate 1/4y with respect to y and them rearrange to get y=f(x)


Posted from TSR Mobile

the closest point would be the point perpendicular?

I see.

Have a look at my above workings. They show the book to be correct. Their A is my k.

Posted from TSR Mobile

Don't know about you both but I got this:



If you sub in y=2, x=1 you get k=18.

If you then sub x=10 into my final equation, that gives y=12.5 when x=10.

Is this correct?

Technically the constant should also be raised with e, making it the multiplier that I've renamed k.

yep y = 12.5

Posted from TSR Mobile

Ballin for this exam now, think it's gonna be a right bastard of a paper

The only annoying part is that I could not even sit it and get an A, but I need that 90 for an A*, weird system