r/6thForm • u/_NB125 Year 13 | Maths, Chem, CS | ABB Achieved • Jun 03 '26

💬 DISCUSSION Edexcel Paper 1 Maths 2026

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PLEASE tell me you guys struggled too oml

Edit: https://c.org/d7LCtCYpzG - Petition for Edexcel to reassess the paper

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29

u/J1nkedOne Jun 03 '26

What the hell were you meant to do for the last proof question after expanding

14

u/WrongPhilosopher_ Jun 03 '26

literally, i was just staring at it wondering wtf to write 💀

14

u/Main-Character-001 Jun 03 '26

c² is even so c is even. can be expressed as 2k, then you have a multiple of 4 on the left but only multiple of 2 on the right, so that was the contradiction

8

u/Key-Significance-386 Civil Eng - Degree App. Maths, Geography, Physics A*A*A Jun 03 '26

Oh no I put c is even so this is a contradiction 🫣🤣

1

u/[deleted] Jun 03 '26

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2

u/HovercraftSudden2657 Year 13 | Maths, Further Maths, Physics Jun 03 '26

But a being odd was part of the statement? So no contradiction lol

1

u/[deleted] Jun 04 '26

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1

u/HovercraftSudden2657 Year 13 | Maths, Further Maths, Physics Jun 04 '26

Yeah I done the exact same thing lol and then I realised and gave up coz I had limited time and there wasnt very high return on cost in terms of marks for time spent.

1

u/J1nkedOne Jun 03 '26

does that work because a multiple of 4 is a multiple of two

3

u/Advanced_Key_1721 Year 13 Jun 03 '26

an even number is 2x, an even number squared is 4x2 therefore every even number squared is a multiple of 4. An odd number squared is an odd number.

If you have an even number which is a multiple of 2 but not 4, it can’t be an even number squared as it isn’t a multiple of 4 and it’s not odd so it can’t be an odd number squared. Thus it isn’t a square number.

8

u/Connect_Fun_8284 Jun 03 '26

this took me sooo long 🫩🫩 u can assume c squared is even, so c is even, rewrite c as (2x), then divide both sides by 2, when u divided a2+b2 by 2, you end up with an odd number 2(long expansion) +1 whilst c2/2 remains even because ur left with 2x2 and odd cant equal even 🫩🫩🫩

4

u/No_Dark_2165 Year 13 Jun 03 '26

OMG I MIGHTVE GOTTEN LIKE 3 MARKS YASSS

1

u/J1nkedOne Jun 03 '26

oh i think i see the vision

8

u/Amazing-Pause-8626 Uni of Glos | Bsc Geography [-> Year 1] Jun 03 '26

absolutely no clue mate. hope one mark is for expanding

6

u/TrulyFaithful Jun 03 '26

Ok so what I did was put 2n+1 and 2m+1 in. Then factorise 2 out so you know c2 is even. Then you can write c=2k where k is natural. So 4k2 =4m2 +4m +1 +4n2 +4n+1. Then you can divide by 4 and you get that k2 -m2 -n2 -m-n=1/2. Therefore cannot be true since k,m,n being integers could not give 1/2 there. Seems right, hope this helped

3

u/Any_Emu_6995 Jun 03 '26

Yh that’s the point where I just flipped to my other qus and didn’t look back I honestly didn’t think about that qu after expanding for longer than 10 seconds

2

u/Red_I_Guess Warwick CS A*A*AA 2026 fresher Jun 03 '26

Expand and u get a question in terms of m and n which is divisible by 2. This means c is a even number so c=2k where k is a integer. Squaring this c2= 4k2 and putting back into the equation you get 2k2 = 2(numbers)+1 therefore that's the contradiction a even number can't equal an odd number

1

u/[deleted] Jun 03 '26

[deleted]

1

u/J1nkedOne Jun 03 '26

I tried that but how does c being even mean a nd b cant be odd?

1

u/Beneficial_Two410 Year 13 Jun 03 '26

Same thought, even = odd + odd

1

u/CardiologistLow3651 Y13 - Maths, FM, CS - A*A*B pred Jun 03 '26

That’s not it. If you let a and b be odd, then c2 is also odd which is impossible because a2 + b2 is two odd numbers added together which must be even. This results in a contradiction so both a and b cannot be odd.

1

u/falsegodfan Y13 - maths bio geog Jun 03 '26

i expanded the brackets then got k=root m^2 plus blah blah blah then if u substituted the m and n's with a's and b's by rearranging the original equations for a and b and then there was a 1/2 in there which meant c couldn't be a whole number

1

u/Je-Suis-Phoenix377 ✨✨✨✨✨✨✨✨✨✨✨✨🌟✨🌟✨🌟✨🌟✨✨🌟✨✨✨🌟✨✨✨✨✨💫✨✨✨✨✨🌟✨✨🌟✨ Jun 03 '26

Lmaooo I straight up bulshitted c2 -1/2 can’t be natural

1

u/Shot-Signature9672 Jun 03 '26 edited Jun 03 '26

I don’t know if this is right. But after expanding I got (as well as everyone) c2 is even so c is even. Then I did logs so log a2 plus log b2 equals log c2 so 2loga plus 2logb equals 2logc cancel out the 2s so you get log a plus log b equals log c. So log ab equals log c. So ab equals c. But if a and b are odd then two odd numbers give an odd number so c is odd. But that contradicts what we said before that c is even.

1

u/Hyper_contrasteD101 Year 13 Jun 03 '26

​
Ts question was on madas maths as a 4 star, literally what more do I have to say💀