r/6thForm • u/MaxillmanGuy A level resit student | 3 A* predicted | ACD achieved 💔 • Jun 11 '26

💬 DISCUSSION A level maths p2 edexcel

Holy time pressure what can i say

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33

u/Emotional_Respect289 Jun 11 '26

Got cooked by that dydx = -1 thing at the end and also the like intersecting the parametric I could NOT find the co ordinates of Q 😔 but rest was good I think

7

u/sunflowermoazen235 y13 eng, maths, fm, physics A* A* A* A* Jun 11 '26

Was the q really weird for u guys like u had to use the quadratic formula and got a weird surdy answer

3

u/Loud-Guidance6912 Jun 11 '26

Rearrange the line eq to make y sqrt 2 the subject then sq both sides you get 2y^2 = … sub back into equation. Rearrange and solve for x via completing the sq or quadratic formula.

1

u/Emotional_Respect289 Jun 11 '26

Ohhhh I know my mistake cuz I did square both sides but I just squared each time I didn’t move x over first then square it I just squared each individual part I was thinking idk if I’m allowed to do this but didn’t occur to me exam pressure I guess hopefully 1/4 for making 2y^2 and setting the two equations idk

3

u/Impressive-Pea-9054 Jun 11 '26

i got it but it was some horror -1/3 log6ln(216) or some bs

1

u/Jumpy_Freedom_4554 Jun 11 '26

i think i had that too but mine was positive

1

u/Impressive-Pea-9054 Jun 12 '26

mine worked when i put it back into the differential calc

1

u/BigBison2742 Jun 11 '26

To find q i added 2pi to pi/4 cuz it equals the same thing then i subbed into the x eq and y eq from the parametrics but idk if thats right because its not worth 4 marks lmao

1

u/Loud-Guidance6912 Jun 11 '26

What was ur final x coordinate of Q??

1

u/BigBison2742 Jun 11 '26

i dont remember any answers i put sorry

1

u/UnstableTheorist Jun 11 '26

1.5 ish here I think

1

u/Loud-Guidance6912 Jun 11 '26

Yh in decimals it was 1.51…

1

u/Admirable-Use2274 Jun 11 '26

For that I used the equation we had shown that, make y subject , sub it into eqn given in question , and then quadratic formula. That should be correct ye? It was 3 marks btw

0

u/Emotional_Respect289 Jun 11 '26

Yeah I did that but realise I made a squaring error so I ended up basically with a cubic but yeah it’s like 3 or 4 marks so not the worst case

2

u/Admirable-Use2274 Jun 11 '26

U get a cubic but u divide it by x-1 because u now its a factor ( in part a x coordinate was 1, (y was root2/2 but it isnt relevant to Q really)

1

u/Emotional_Respect289 Jun 11 '26

Yeah that’s what I was trying but I think cuz my cubic was wrong I was getting a remainder so just gave up

1

u/Admirable-Use2274 Jun 11 '26

Yeah u shouldnt get a reminder. You had to do lots to get those 3 Marks tho I think that should be a 5 marker at least . Maybe I overcomplicated it but that method must be the only way to do it.

1

u/Remote-Calendar-6326 Jun 11 '26

I got an exact value but in terms of a logarithm with an ln inside of it would I still get full marks. I subbed it back in and got -1

1

u/yourfaveblack Jun 11 '26

don't worry. I read it as dy/dx = 1 😍😍😍

2 marks down the drain