Maths IGCSE Edexcel Paper 3H

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It was meant to be 3H... The easy one. The whole N = 2^22 - 1 was utterly stupid and was not very logical to find out really

I didn't get it either but what you had to do was put 2^22 into your calculator, then press SHIFT + FACT on your calculator. This will give you three prime factors. One you leave on its own, and the other two you times together to give you your two results which multiply to give 2^22

Reply 21

Itssleah

Original post by BlackLocust

The answer had to equal 2^22-1, so the answer can only be 2047*2049.

The problem is with the brackets (2^10+1)(2^12-1) is that the answer isn't correct at least that is what me and my friends think, becuase the 2^10 and 2^12 don't cancel out. It helps to thing of it as a difference of two sqares if that helps.

****.....haha I spent too long on that one!

Reply 22

Itssleah

Original post by 123uk

i didn't get it either but what you had to do was put 2^22 into your calculator, then press shift + fact on your calculator. This will give you three prime factors. One you leave on its own, and the other two you times together to give you your two results which multiply to give 2^22

omg i love u so much i never knew about fact on the calc!!!!

Reply 23

Yuuchin1

Original post by 123UK

... but you needed 2^22-1... Although you couldve done the same i guess on this

part a) "factorise a^2-b^2" was the hint

Reply 24

shahkush11

i found the paper gooood!!!!

(edited 8 years ago)

Reply 25

Blue Butterfly

Lmao if anyone wanted something to cheer them up :h:

http://youtu.be/7BbkkBLjNjo

Reply 26

vikstaa

hopefully the boundary's will be low!!

Reply 27

vikstaa

Original post by Yuuchin1

lol we even had the same letters- its 0.980 tho cos its 3sf

i got that too

Reply 28

janster111

Original post by Tanzi_a

Lmao if anyone wanted something to cheer them up :h:

http://youtu.be/7BbkkBLjNjo

Can't believe they still make these! Hahaha

Reply 29

0mm0

What was the answer and working to the last question and how many marks was it

Reply 30

ibrahim24

Original post by 0mm0

What was the answer and working to the last question and how many marks was it

it was 4 marks. missed it out so sorry :frown:

Anyone else know

Original post by 0mm0

Anyone else know

Ah yeah it was a vector question. I think I got both but I forgot the answers, sorry!
Something along the lines of -a + 3b or something like that sorry don't rember the question :P

Reply 33

Yuuchin1

I got 3a+3b then 2a-4b (all underlined ofcourse)

Reply 34

janster111

Original post by Yuuchin1

I got 3a+3b then 2a-4b (all underlined ofcourse)

I don't even remember the question but I think I got something like that :smile:

Dalit...

Original post by janster111

Ah yeah it was a vector question. I think I got both but I forgot the answers, sorry!
Something along the lines of -a + 3b or something like that sorry don't rember the question :P

I don't even know, all i saw was steam being let off down your end

Reply 37

janster111

[QUOTE=TømBrøm;56095649]I don't even know, all i saw was steam being let off down your end

Ah the main man him self hahaha. Mate I was laying it in my seat hahaha