You are Here: Home >< Maths

# AQA A Level Maths Core 1 - 18th May 2016 [Exam Discussion]

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. (Original post by timtjtim)
Hmm, minus one or two for an addition error. If you got that the triangle = 9 I expect you get an ECF for the area, so just one or two less.
Was wondering where you got this from? I too messed up the integral and it's reassuring to know previous errors supposedly don't carry on, could you confirm where you got this from?
3. (Original post by medicine71012)
http://www.thestudentroom.co.uk/show....php?t=4095491
its not complete but it has the most answers
4. (Original post by EwanatTSR)
That should be a B. Normally an A would be around the 63-65+ mark so you should have a strong B .
Im kinda nervous though, like in june 2012 it was 51 for a B but in june 2015 it was 58! Surely the boundaries cant egt any higher its ridiculous, for people like me where it actually trakes so much effort to get good at the exams.
5. (Original post by Fambox)
I got the same I hope we are right !!! Mine was in fraction form like 135/12
I got 135/12 as well but after exam I found the simplified form is 45/4, do you think we will lose mark just because our answers are not simplified????
6. Mark for A predictions? How did everyone find it as a whole
7. (Original post by money-for-all)
(X-5)^2 - 25 + (Y+3)^2 -9 = radius

(x-5)^2 + (y+3)^2 -34 = radius

(x-5)^2 + (y+3)^2 = 34

thats wrong because we didnt originally complete the square
you are jumping to the second half of completing the square which is not what we were asked to do

completing the square
1) make sure coefficient of x^2 = 1
2) take out a factor of x from X^2 and bx
3) half the coefficient of bx
4) raise the new B and x to the power of 2
5) AND THEN MINUS THE SQUARE OF THE NEW B

you jumped to number 5 without doing all the before, how is that right
thats like doing this

y=x^3 +5x
dy/dx = 3x^2
you see where its wrong? the 5x is differentiated twice this is the same as what u done, jumped the gun
8. (Original post by money-for-all)
(X-5)^2 - 25 + (Y+3)^2 -9 = radius

(x-5)^2 + (y+3)^2 -34 = radius

(x-5)^2 + (y+3)^2 = 34

You only complete the square when you are given x^2 + y^2 + ax + by + c = 0. You don't when you are given the Centre and a point.

You simply put (x-a)^2 + (y-b)^2 = r^2 where Centre = C(a,b) and r = radius.

To calculate R use Pythagoras.
9. (Original post by tajtsracc)
Was wondering where you got this from? I too messed up the integral and it's reassuring to know previous errors supposedly don't carry on, could you confirm where you got this from?
Sure, I've attached an image (tangent.png) to make it clearer.

The area of the integral (dark grey and light grey) was 81/4 or 20.25.

But we don't want the light grey section (because we want it bounded by the tangent). So, using the coordinate of Q(-5/4,0) we determine that the base of the triangle is 3/4. The height it 24, and (24 x 0.75) / 2 = 9 (second image)

For my workings, I wrote that 9 = 36/4, and then 81/4 - 36/4 = 45/4 or 11.25
Attached Images

10. (Original post by medicine71012)
Mark for A predictions? How did everyone find it as a whole
It was okay. Lots of big scawee numbers in the surds question - and I used all but 4 minutes of the time - I normally have 30 minutes left on past papers.

For an A... Hmm, I'm guessing 62, but maybe the same as last year (64).
11. was the length of ct root 65?
12. omdays, you guys are giving such mixed answers your scaring the hell outaa meh >;'(((
13. (Original post by timtjtim)
Sure, I've attached an image (tangent.png) to make it clearer.

The area of the integral (dark grey and light grey) was 81/4 or 20.25.

But we don't want the light grey section (because we want it bounded by the tangent). So, using the coordinate of Q(-5/4,0) we determine that the base of the triangle is 3/4. The height it 24, and (24 x 0.75) / 2 = 9 (second image)

For my workings, I wrote that 9 = 36/4, and then 81/4 - 36/4 = 45/4 or 11.25
No no no, I was referring to what you said about the marks. The entire question was out of 8, I got the area of the triangle correct but I messed up the integral, you said only 2 marks are lost but shouldn't more be lost?
14. (Original post by timtjtim)
you only complete the square when you are given x^2 + y^2 + ax + by + c = 0. You don't when you are given the centre and a point.

You simply put (x-a)^2 + (y-b)^2 = r^2 where centre = c(a,b) and r = radius.

To calculate r use pythagoras.
oh my days tim tim , you are clapped fam.

Why you bringing pythagoras into this ? Thats just the same as saying you use logarithms to integrate...
15. (Original post by Not a Genius :()
omdays, you guys are giving such mixed answers your scaring the hell outaa meh >;'(((
http://www.thestudentroom.co.uk/show....php?t=4095491
16. (Original post by df97)
Hey, I can't remember all the questions but here are some of my answers. Let me know if you disagree with any!
1)m=-5/3 B(-3,4) k=-30
2)(3rt5)^2=45 75-32rt5
Can't remember the rest so here are some of my other answers I remembered in random order:
Area under curve=81/4 Area shaded region=45/4
(x-7/4)-41/4 (asked for rational form so use fractions) minimum point=-41/4 graph translated by vector [1/2, 41/4]
d^2y/dx^2=-2x-9x^2 sub in x-coord of p to get 45, 45>0 therefore minimum
B(12,-7) m=-4/7 m(tangent)=7/4 7x-4y+18=0tangent for k (used b^2-4ac=0) k=20 k=4
(x-5)^2+(y+3)^2=65 length of CT=9
y=-32x-40 x-coord Q=-5/4 for graph i had n-shaped parabola intersect y-axis at 8 and x-axis at -1+-rt5
three linear factors were (x-3)(x-4)^2
for the remainder theorem I think I got 20
For x I got <-3/2 and >6
Also k=20 and 4
17. (Original post by moe889)
was the length of ct root 65?
no it was 9
18. (Original post by money-for-all)
oh my days tim tim , you are clapped fam.

Why you bringing pythagoras into this ? Thats just the same as saying you use logarithms to integrate...
lol because there is a right angle triangle?

we have co ordinates of A and C
you can work it out from there
19. (Original post by money-for-all)
oh my days tim tim , you are clapped fam.

Why are you bringing Pythagoras into this ? That's just the same as saying you use logarithms to integrate...
Take a look at my image I've attached for you bruv. As you can see, you go to the side 7 and you're uppin and downin by 4 - well 4^2 + 7^2 = 16+49 = 65.

I've attached a second image, of desmos, showing that the only circle which intersects A has radius of 65 - waddya think? If you're still not getting the hang of these circles, feel free to drop me a private message bro.
Attached Images

20. How did u find the coordinates of B

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: August 17, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### University open days

Is it worth going? Find out here

Poll
Useful resources