# Edexcel Maths calculatorWatch

This discussion is closed.
13 years ago
#21
**** why on earth did i think so?at first i wrote 1250/65.then i thought it is too easy for 3 mark question so i changed it to 65.5 and 1255. ****ing hell. where did i get 65 from?it is upper bound. for christ sake, my exam went ****. I even wrote my signature in the surname field. ****in hell how stupid i am.lol.
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13 years ago
#22
I found the complete the square one pretty hard. The first part where you had to prove. But the second part was ok, i got 1.5 and -1.5 anyone get the same??
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13 years ago
#23
i dont remember anything related to complete the square. what did everyone do for finding the mean for the histograms. at first i thought 120/6, but then i thought it was too easy for 4 mark question, so i did times every frequency by the maximum value of interval, sum them and divide by 6. is it right?
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13 years ago
#24
i got 6.08 hours because the mean is Efx/Ef, which was 730/120 = 6.08

Efx is the total of the product of the frequency and mid-class value
Ef is the total frequency
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13 years ago
#25
(Original post by IZZY!)
i dont remember anything related to complete the square. what did everyone do for finding the mean for the histograms. at first i thought 120/6, but then i thought it was too easy for 4 mark question, so i did times every frequency by the maximum value of interval, sum them and divide by 6. is it right?
For this one you had to:
Find the midpoint of range
Multiply these by the frequency
Add together all the answers
Then divide by 120
(i hope thats right!)
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13 years ago
#26
Are we on about EDEXCEL Higher tier here or wat !

(Original post by IZZY!)
i dont remember anything related to complete the square. what did everyone do for finding the mean for the histograms. at first i thought 120/6, but then i thought it was too easy for 4 mark question, so i did times every frequency by the maximum value of interval, sum them and divide by 6. is it right?
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13 years ago
#27
(Original post by VeerHS)
For this one you had to:
Find the midpoint of range
Multiply these by the frequency
Add together all the answers
Then divide by 120
(i hope thats right!)
Yep that's right
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13 years ago
#28
(Original post by pete77)
Are we on about EDEXCEL Higher tier here or wat !
yes we are talking about Edexcel Higher Tier and there wasn't anything specifically about completing the square.
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13 years ago
#29
****, i ****ed up 2 questions already. this is 7 marks.lol.
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13 years ago
#30
Phew... By the sounds of it i've got a few right!!!

Just wondering how did people solve the hexagon based pyramid question part C where you had to find angle AVC. Anyone got any clue because i didn't have a monkeys!!

also how did people factorise aÂ²-9bÂ² .

Thanks a lot
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13 years ago
#31
(a-3b)(a+3b) the difference of squares
for pyramid c i used 2 times cosine rule.
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13 years ago
#32
what about part A of the pyramid question
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13 years ago
#33
by the sounds of it...at least i got a few right! what about everyone else?
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13 years ago
#34
guys i just did edexcel higher and nothing bout surds or complete the square....

i cudnt do part C of pyramid..

6.08 is rite and so is 20.7 for the previous questions
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13 years ago
#35
damn i knew it was the two sqaures thing.

Anyway, if you can remember how exactly did you use the cosine rule with the hexagon praymid question C.

Thanks
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13 years ago
#36
(Original post by arsenalfan1988)
what about part A of the pyramid question
i used pyphagoras theorem
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13 years ago
#37
yea it was 5.66
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13 years ago
#38
I got x=-3 and y=-2 and x=3.4 and y=1.2 aswell
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13 years ago
#39
(Original post by c013310)
damn i knew it was the two sqaures thing.

Anyway, if you can remember how exactly did you use the cosine rule with the hexagon praymid question C.

Thanks
well it was hard to guess for me.i cant rly explain it lol. i dont have time, revising for next geo.lol.sorry.
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13 years ago
#40
for question 19, here are my answers:

a)5.66cm
b)38.9*
c)33.6*
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