GCSE Maths
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GCSE Maths
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!
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!
Big Boy Bulley Number of posts : 3319
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Re: GCSE Maths
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 Alevels myself atm, no maths though (Biology, psychology, English Language). :3
Good luck all =o
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 Alevels myself atm, no maths though (Biology, psychology, English Language). :3
Good luck all =o
NotABrick Number of posts : 55
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Re: GCSE Maths
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.
Maths is great and i hope you do well.
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Re: GCSE Maths
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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Re: GCSE Maths
Is noone going to explain the cosine rule?
twaters Number of posts : 3177
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Re: GCSE Maths
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.twaters wrote:Is noone going to explain the cosine rule?
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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Re: GCSE Maths
...........................................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...)
........................................./....\.....................................
...................................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 twaters on Mon Jun 02, 2008 6:21 am; edited 7 times in total
twaters Number of posts : 3177
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Re: GCSE Maths
Hmm. I made a perfect triangle, and that's what happens...
twaters Number of posts : 3177
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Re: GCSE Maths
...............A................
............../..\............
............/......\..........
........c./.........\.b.........
........./............\........
......../_________\....
......B.......a........C
............../..\............
............/......\..........
........c./.........\.b.........
........./............\........
......../_________\....
......B.......a........C
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Re: GCSE Maths
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 SOHCAHTOA too
Had a good way of remembering SOHCAHTOA too
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Re: GCSE Maths
Jasperking wrote:
Had a good way of remembering SOHCAHTOA too
silly old hags can always have tea on aeroplanes?
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Re: GCSE Maths
not that exact one but thats a good one too :p
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Re: GCSE Maths
just did my exam of civil law and computer sience.
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Re: GCSE Maths
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.
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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Re: GCSE Maths
I'll be so pissed off if I don't get an A* in maths.
Shask Number of posts : 61
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Re: GCSE Maths
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>2x5
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^24ac))/2a doesnt work as roots are complex root(47)
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Re: GCSE Maths
Hmm, KIA is right, although he got the formula wrong, its b.
I found my maths exam really easy myself.
I found my maths exam really easy myself.
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Re: GCSE Maths
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
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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Re: GCSE Maths
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 .
also the part i got wrong doesnt matter as root(47) isnt done at GCSE so you can stop there.
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 .
also the part i got wrong doesnt matter as root(47) isnt done at GCSE so you can stop there.
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Re: GCSE Maths
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!
I just cant believe such a boring topic is getting so many posts!
Big Boy Bulley Number of posts : 3319
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Re: GCSE Maths
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 Xaxis
have fun. The last one is rather simple but it takes some time before you see how to solve it.
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Re: GCSE Maths
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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Re: GCSE Maths
the first one
the second one
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
 Spoiler:
 }
2*cos5X*cos4X dx
=}sin (5x+4x)+sin(5x4x)dx
=}sin 9x dx+}sin x dx
=1/9}sin9x d9x+}sinx dx
=1/9 cos 9xcosx+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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Re: GCSE Maths
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(5x4x) = 2*sin5x*cos4x not 2*cos5x*cos4x
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(5x4x) = 2*sin5x*cos4x not 2*cos5x*cos4x
KIA Sneak Number of posts : 2295
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