* Leaving Cert Ordinary Level Maths - both papers

FatRat · 06-06-2014 11:23am

Need help, when getting the roots of a complex equation using de moivres theorem.. I know that you put it in general polar form and if the equation is z^4 then you multiply the whole equation by 1/4 to get z. But what about the value for r? You multiply it by 1/4 too or do you use the inverse square root of 4 to get a different value for r?

Trouble with this maths is that its so hard to explain your situation! I hope I made some sense..

blueb · 06-06-2014 11:25am

i before e except after c

sylviaplath32 · 06-06-2014 11:29am

Somebody please help! Doing simultaneous equations and stuck on this:

2f + 2/3g + 1 = 0
f + 1/2 g + 1 = 0

What do I do with the fractions?

skippy1977 · 06-06-2014 11:32am

For the complex numbers you get the 4th root of r. You multiply the angle (including 2 pi n) by 1/4. Then sub in n=0, n=1, n=2, n=3

FatRat · 06-06-2014 11:32am

I get the complex roots thing now, spotted it in the book! So no need to reply

gal555 · 06-06-2014 11:53am

sylviaplath32 wrote: »

Somebody please help! Doing simultaneous equations and stuck on this:

2f + 2/3g + 1 = 0
f + 1/2 g + 1 = 0

What do I do with the fractions?

I'm no maths genius by any means but...
I think you put both equations over 6 as its the LCD of both fractions

So you're left with:
12f + 4g + 6 = 0
6f +3g + 6 = 0

Then you just treat it as a normal simultaneous equation.

a0ifee · 06-06-2014 11:56am

FatRat wrote: »

Need help, when getting the roots of a complex equation using de moivres theorem.. I know that you put it in general polar form and if the equation is z^4 then you multiply the whole equation by 1/4 to get z. But what about the value for r? You multiply it by 1/4 too or do you use the inverse square root of 4 to get a different value for r?

Trouble with this maths is that its so hard to explain your situation! I hope I made some sense..

is this on the ordinary course?! I can't find it anywhere in my book

caolan1996 · 06-06-2014 12:05pm

its higher i think
well i hope it is anyway

Saxo · 06-06-2014 12:22pm

Has anyone done the question in the exam papers about the wheat production and calculating how many hectares of wheat he can get etc, think its 2012 paper 1? might be wrong. fair confused with this question, hope something like it doesnt come up today.

Aarong9224 · 06-06-2014 12:25pm

sylviaplath32 wrote: »

Somebody please help! Doing simultaneous equations and stuck on this:

2f + 2/3g + 1 = 0
f + 1/2 g + 1 = 0

What do I do with the fractions?

The other explanation is wrong
you multiply the bottom line by -2
then you can cancel the f's
then treat it as a normal similtanois equation

if your still stuck theres a worked example in the marking scheme on examanationsdotie

JoeyBohs · 06-06-2014 12:28pm

Saxo wrote: »

Has anyone done the question in the exam papers about the wheat production and calculating how many hectares of wheat he can get etc, think its 2012 paper 1? might be wrong. fair confused with this question, hope something like it doesnt come up today.

I tried to do it..didn't get very far though

Saxo · 06-06-2014 12:30pm

JoeyBohs wrote: »

I tried to do it..didn't get very far though

Its sick, some of the questions expect you to work backwards all the time without giving you much information!

matthew the statue · 06-06-2014 12:37pm

Is there many just looking to pass? Im so scared that I will fail this ugh

Noccy_Mondy · 06-06-2014 1:25pm

Please guys, make sure you read each question carefully, and make sure that you are answering each question correctly - especially with this project maths, make sure that you answer what's being asked, it's easier to get sidetracked and confused with more writing on the page. With regards thinking you are going to fail - you won't if you try each question, don't leave anything blank, there are plenty of attempt marks to be gotten. Give a fair stab at every question. It's the first proper year of project maths, so my thinking is that the marking won't be too hard. Best of luck to ye all!

TheBoss11 · 06-06-2014 4:46pm

Paper was probably the easiest in years. Anyone else find it quite easy?

TaiHusky · 06-06-2014 4:49pm

That was fecking hard. I mean, what wis with the f:x question and the cardboard square one!?

Hollister11 · 06-06-2014 4:53pm

Smashing little paper

Saxo · 06-06-2014 4:56pm

TaiHusky wrote: »

That was fecking hard. I mean, what wis with the f:x question and the cardboard square one!?

Horrible horrible paper

completely messed up!!

nimrod86 · 06-06-2014 5:01pm

Don't think I did well there at all...

I think I got all the financial maths ones mostly right, and then the rest I'll be hoping to scrape by on attempt marks

Saxo · 06-06-2014 5:03pm

nimrod86 wrote: »

Don't think I did well there at all...

I think I got all the financial maths ones mostly right, and then the rest I'll be hoping to scrape by on attempt marks

Did you use the Sn formula in the log tables? hadn't a clue about any of the functions

paper 2 will be even worse.

Siffo · 06-06-2014 5:06pm

Saxo wrote: »

Did you use the Sn formula in the log tables? hadn't a clue about any of the functions paper 2 will be even worse.

ye I used the Sn formula from the log tables and let a = 13 and d = -2 I think.. Ended up getting n = 25 in last part so I think it worked out okay

omara95 · 06-06-2014 5:06pm

Handy paper 1. Lets hope paper 2 is the same!

onethreefive · 06-06-2014 5:07pm

I can kiss goodbye to college now. Absolutely devastated. It feels like my life is ruined.

Saxo · 06-06-2014 5:10pm

Siffo wrote: »

ye I used the Sn formula from the log tables and let a = 13 and d = -2 I think.. Ended up getting n = 25 in last part so I think it worked out okay

My lord I did so bad, I used 1 as the first term and 2 as the difference

thought it meant go from T1, T2, T3 etc. so frustrated

KellyR18 · 06-06-2014 5:11pm

I thought it was awful!!! It started off well then went horrible! The last question was fine but the middle was not the best. Can you repeat just maths on its own? I need a min of C3 for course and I don't think I'm gonna get?

Siffo · 06-06-2014 5:14pm

KellyR18 wrote: »

I thought it was awful!!! It started off well then went horrible! The last question was fine but the middle was not the best. Can you repeat just maths on its own? I need a min of C3 for course and I don't think I'm gonna get?

Some colleges offer Special Maths Exams for people who didnt get their grade in the leaving cert, have you had a look at them? You'll probably be ok, they throw marks at you in ordinary maths for attempting and stuff

Buataisti · 06-06-2014 5:17pm

Fairly certain the final long question had a mistake printed. After asking you to differentiate it then asks for the maximum height of the rocket, which has already been given. I think it was supposed to ask for the maximum speed given the question prior to it.

onethreefive · 06-06-2014 5:18pm

Buataisti wrote: »

Fairly certain the final long question had a mistake printed. After asking you to differentiate it then asks for the maximum height of the rocket, which has already been given. I think it was supposed to ask for the maximum speed given the question prior to it.

Was the maximum height of the rocket 25m? I just read it from the graph but I'm not sure if there was a trick question in there.

nimrod86 · 06-06-2014 5:20pm

Saxo wrote: »

Did you use the Sn formula in the log tables? hadn't a clue about any of the functions paper 2 will be even worse.

I tried to use the Sn formula, but kept getting syntax errors on my calculator... ended up just writing as much as I could out and hoping for attempt marks

Catherinem1616 · 06-06-2014 5:21pm

onethreefive wrote: »

Was the maximum height of the rocket 25m? I just read it from the graph but I'm not sure if there was a trick question in there.

I thought it was a trick question and said 25m aswell!!

***** Leaving Cert Ordinary Level Maths - both papers ****

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* Leaving Cert Ordinary Level Maths - both papers