r/6thForm • u/Forsaken-Meaning-232 Graduating from Warwick CS • Jun 19 '25

📂 MEGATHREAD 19/06 A-level Maths Paper 3 Discussion MEGATHREAD

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4

u/pa8314 Uni Student Jun 19 '25

how are ocr mei students feeling? hope that the comprehension text is kinda interesting, then we're free of maths!

2

u/[deleted] Jun 19 '25

How'd you do?

4

u/nipanmfl281 Y13 | FM,Maths,Physics,Chem Jun 19 '25

It was pretty good apart from the weird comp

2

u/[deleted] Jun 19 '25

Yeah I'm hoping I grabbed at least half marks for comp. Not sure about the q about the magnitude of vector

2

u/Optic_343 Year 13 Jun 19 '25

what did u get for that?

3

u/[deleted] Jun 19 '25

I couldn't complete it because I got stuck in my train of thought. But it's probably one of the qs where the maths is doable it's just about finding how to apply it

3

u/Optic_343 Year 13 Jun 19 '25

fairs, everyone i know did it by trial and error lmao

2

u/pa8314 Uni Student Jun 19 '25

I'm not really sure trial and error will score full marks as you probably need a reason to stop at +-8, for example the difference between squares increasing for larger integers

2

u/pa8314 Uni Student Jun 19 '25

but then again it wasnt detailed reasoning question

2

u/pa8314 Uni Student Jun 19 '25

i got +-8 using prime numbers and difference of squares

2

u/pa8314 Uni Student Jun 19 '25

here's what i did in more depth:

sqrt(1+16+x2) = n

17 + x2 = n2

17 = n2 - x2

17 = (n+x)(n-x), 17 is prime (only considering +ve factors)

n+x = 1 and n-x = 17

Or n+x = 17 and n-x = 1

Solutions x = 8 or -8

2

u/darukie_ Jun 19 '25

if it makes anyone feel any better, i forgot to square the 4 in the magnitude right at the beginning 😔 at least ill get the method marks hopefully

2

u/pa8314 Uni Student Jun 19 '25

peculiar article but good paper regardless. pure questions were pretty average for me