GCSE Maths

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Post by Big Boy Bulley on Mon Jun 02, 2008 3:37 am

Has anyone else got their maths exam today?
Its my best subject so im quite looking forward to it, will be very upset if i don't get an A!
The only thing i struggle with is the cosine rule, anyone got any tips?

Good luck to everyone who is doing GCSE's and A levels atm! Wink Wink Wink
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Post by NotABrick on Mon Jun 02, 2008 5:37 am

Ah trigonometry. Never did get that myself.

The rest of the paper wasn't hard when I did it [2 years ago], so you should be able to get an A fairly comfortably without getting it completely. You should be fine.

I'm doing A-levels myself atm, no maths though (Biology, psychology, English Language). :3

Good luck all =o

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Post by KIA Sneak on Mon Jun 02, 2008 5:44 am

Maths and further maths at ALevel (all hopefully to an A grade) and i'm going to do maths at uni.



Maths is great and i hope you do well.
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Post by frufru on Mon Jun 02, 2008 5:48 am

wow! I failed! english and languages were my thing.. never could get the hang of that adding up lark. good luck in your exam!
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Post by twaters on Mon Jun 02, 2008 5:52 am

Is no-one going to explain the cosine rule?
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Post by KIA Sneak on Mon Jun 02, 2008 5:57 am

twat-ers wrote:Is no-one going to explain the cosine rule?
Not without pictures lol. Ummm from memory isnt it  c^2 = a^2 + b^2 - 2abcos C where C = the angle between a and b.

EDIT: got sign wrong lol


Last edited by KIA Sneak on Mon Jun 02, 2008 7:04 am; edited 1 time in total
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Post by twaters on Mon Jun 02, 2008 6:08 am

...........................................C......................................................................................................................................................./.\.......................................................................................................
........................................./....\.....................................
...................................b.../.......\...a...................................
....................................../ .........\ ...................................
...................................../_______ \...................................
...................................A.......c......B.................................

Big letters are angles, small letters are sides.

Then follow the formula:

c^2 = a^2 + b^2 - 2*a*b*cosC


Edit: i give up on the triangle. Matching big and small letters go opposite one another.

(KIA, your sign was wrong...)


Last edited by twat-ers on Mon Jun 02, 2008 6:21 am; edited 7 times in total
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Post by twaters on Mon Jun 02, 2008 6:09 am

Hmm. I made a perfect triangle, and that's what happens...
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Post by tim09 on Mon Jun 02, 2008 6:11 am

...............A................
............../..\............
............/......\..........
........c./.........\.b.........
........./............\........
......../_________\....
......B.......a........C
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Post by twaters on Mon Jun 02, 2008 6:12 am

Thanks, i'll edit again...
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Post by Jasperking on Mon Jun 02, 2008 7:01 am

Ah GCSE Maths. THe highest i got was a B in the final exam and an A in the modules. Trigonometry wasnt the hardest thing i did though.

Had a good way of remembering SOH-CAH-TOA too
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Post by KIA Sneak on Mon Jun 02, 2008 7:05 am

Jasperking wrote:
Had a good way of remembering SOH-CAH-TOA too

silly old hags can always have tea on aeroplanes?
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Post by Jasperking on Mon Jun 02, 2008 7:06 am

not that exact one but thats a good one too :p
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Post by shadow on Mon Jun 02, 2008 7:14 am

just did my exam of civil law and computer sience.
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Post by Big Boy Bulley on Mon Jun 02, 2008 9:45 am

I'm back from my exam and due to the hard revision this morning, i mastered the cosine rule and recurring decimals.
I reckon im pushing for an A*, very confident that i got 80+ out of 100.
Only a couple of questions i couldn't really answer!
1. Solve the inequality 2x+3 > 4x+5 ?
2. Solve the equation 2xsquared +3x +7 = 0

And the back page wordy one which i cant remember and don't want to.
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Post by Shask on Mon Jun 02, 2008 9:46 am

I'll be so pissed off if I don't get an A* in maths.
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Post by KIA Sneak on Mon Jun 02, 2008 10:16 am

Big Boy Bulley wrote:
1. Solve the inequality 2x+3 > 4x+5 ?
2. Solve the equation 2xsquared +3x +7 = 0

And the back page wordy one which i cant remember and don't want to.

1)
3>2x-5
8>2x
4>x

2)2x^2 + 3x + 7 = 0
= hmmmm ok this one can't be done at GSCE. Do you have the number right?

(B+-Root(b^2-4ac))/2a doesnt work as roots are complex root(-47)
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Post by StanWephen on Mon Jun 02, 2008 11:14 am

Hmm, KIA is right, although he got the formula wrong, its -b.

GCSE Maths 3ea647783b5121989cd87ca3bb558916

I found my maths exam really easy myself.
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Post by Big Boy Bulley on Mon Jun 02, 2008 11:23 am

Yeah i found it fairly easy apart from the odd question, im sure the numbers i gave are correct, however it also said give your answer to 2 decimal places. Can't remeber exactly but I ended up doing:

2x^2 + 3x + 7 = 0
2x^2 + 3x = 7
2x + square root of 3x = square root of 7
became 3.4ish x = 2.4ish
x = 0.8ish

Probs completely wrong lol
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Post by KIA Sneak on Mon Jun 02, 2008 11:24 am

lol thats 2 wrong so far.

You have to remember that GSCE was a lot of maths ago for me and i use the calc to do all this stuff now Smile.

also the part i got wrong doesnt  matter as root(-47) isnt done at GCSE so you can stop there.
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Post by Big Boy Bulley on Mon Jun 02, 2008 11:31 am

Yeah i had calculator i just didnt have a clue what to do, all in all i think i should be around the A/A* border!

I just cant believe such a boring topic is getting so many posts!
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Post by shadow on Mon Jun 02, 2008 11:32 am

Big Boy Bulley wrote:I'm back from my exam and due to the hard revision this morning, i mastered the cosine rule and recurring decimals.
I reckon im pushing for an A*, very confident that i got 80+ out of 100.
Only a couple of questions i couldn't really answer!
1. Solve the inequality 2x+3 > 4x+5 ?
2. Solve the equation 2xsquared +3x +7 = 0


lol that's easy, I wish we had questions like that. The questions we get are more like:

prove and calculate Pi till 8 number behind the comma.

we have maths in 2 days. here are some questions for those who like to solve it:

}= unknown integral

1.) }2*cos5X*cos4X dx=
(hint: use the formulas of simpson)



2.) calculate the area limited by a curve of a sinusoid and the X-axis


have fun. The last one is rather simple but it takes some time before you see how to solve it.
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Post by KIA Sneak on Mon Jun 02, 2008 11:33 am

Big Boy Bulley wrote:

I just cant believe such a boring topic is getting so many posts!

boring lol. Ive done 8 lessons of maths a week for the last two years and plan on doing it for the next 3 years of my life if i thought it was boring my life would suck.
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Post by shadow on Mon Jun 02, 2008 11:40 am

the first one
Spoiler:
}
2*cos5X*cos4X dx
=}sin (5x+4x)+sin(5x-4x)dx
=}sin 9x dx+}sin x dx
=1/9}sin9x d9x+}sinx dx
=-1/9 cos 9x-cosx+k

the second one
Spoiler:

you better draw that one before you start calculating

upper limit= pi; lower limit=0}sinx dx
=[-cosx] upper limit pi; lower limit 0
= -cos pi+ cos 0
=1+1=2


told ya it was easy


don't know if I used the correct English words since my knowledge of English doesn't go that far that I know mathematic symbols in English
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Post by KIA Sneak on Mon Jun 02, 2008 11:55 am

not sure whether i agree with the first answer.

Simpson’s rule...... is like the trapezium rule and im not sure how you used it.

it looks like we get taught different things here but anyway

sin (5x+4x) + sin(5x-4x) = 2*sin5x*cos4x not 2*cos5x*cos4x
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