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

1. (Original post by student0042)
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.
That makes sense.

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2. 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
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
http://www.thestudentroom.co.uk/show...3#post56093833

Hopefully this clears it up.

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4. stuck on question 1

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5. (Original post by tomixox)
how did you calculate that max is 250 without differentiating it?
By inspection, I guess you could also try different values and find that 250 is a max...
6. (Original post by the_googly)
stuck on question 1

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problem solved

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7. (Original post by the_googly)
stuck on question 1

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How did you do B?

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8. (Original post by CD223)
How did you do B?

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correct?

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9. stuck on question 3b now..

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10. (Original post by the_googly)
correct?

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

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11. (Original post by the_googly)
stuck on question 3b now..

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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)

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12. (Original post by the_googly)
stuck on question 3b now.
(Original post by Jimmy20002012)
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)
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.
13. (Original post by CD223)
I'm just puzzled why you set it to equal zero. Surely that just implies the lines are perpendicular?

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the closest point would be the point perpendicular?

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14. (Original post by Jimmy20002012)
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)

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I did that but couldn't get the correct answer

the book says y=Ax^2/(x+2)^2

is this correct?

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15. (Original post by the_googly)
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.

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16. (Original post by CD223)
I see.

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

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thanks a lot!.

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17. (Original post by CD223)
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

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18. (Original post by the_googly)
yep y = 12.5

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Cool! Glad it's correct. Do my workings make sense?

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19. Ballin for this exam now, think it's gonna be a right ******* 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
20. (Original post by Stepidermis)
Ballin for this exam now, think it's gonna be a right ******* 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
How does that work out? What UMS are you on?

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