Maths HL P 1 - aftermath

chaoticmess · 11-06-2010 05:54PM

mark.oc wrote: »

I got that at first alright, but went back and checked it. The problem was with the definite integral of the part under the x-axis at one. That was 5, taken away from -27, gives -32. Modulus of that plus the original 5 gives 37.

Ohhhh that was sneaky....!
Still, would probably still get plenty of attempt marks right?!

Paddi Jones · 11-06-2010 05:55PM

Its really depressing reading all these "it was easy" answers. Though it certainly was an easier paper, I don't think I did too well. Nice (a) parts I must say, some annoying (c)s.

Only got 5 and a half Qs done.
Fab time management, eh?

scherzo! · 11-06-2010 05:55PM

I kept checking the front of my paper to confirm "Higher Level" written on it, then considered whether my colour vision was going all funky ("Is this really pink?") I liked it. =D

SantryRed · 11-06-2010 05:55PM

Just wondering what people got for Q1 b? How'd yous do it?

Caught · 11-06-2010 05:57PM

theowen wrote: »

That was fun...

OMG, really? I'm a complete weirdo then. I was totally calm, smiling through it. I actually sang The Club Is Alive and all to myself doing the last question [Q4 twas].

CantStandMeNow · 11-06-2010 05:57PM

Craaap.. anyone else give the De Moivre's theorum in carthesian form? i was wondering why it was so untidy it was supposed to be in polar form.. oh well.. it still worked out i just went a step too far they can't really take marks off surely..

Keogg · 11-06-2010 05:57PM

!?! wrote: »

anyone get around 167 I can't remember exactly for the purple?

dont worry i got 199:D oops! Dont mind though, did 8 as an extra question

A little surprised with the S&S in question 1, but then i was like, oh yeah, simple! Really don't agree with leaving out S&S as a whole question not covered, topics can be interchanged throughout pretty much every question. It really is as stupid as just studying Boland. lol.

I got the arg(z) as well. I mean arg... argument, I ended up with t=-8. Thrilled with myself:)

UglyFuc · 11-06-2010 05:57PM

you were supposed to leave the de moiver thing in polar form. it says in the question. for eg Cos72 is like 5 pi over 4 or something

dont put it down as decimels.

Gaga OhLaLa · 11-06-2010 05:57PM

mark.oc wrote: »

Q.1 (a) k = -3, t = 9

(c)(i) -3-b
(ii) -2-2b
(iii) b = -4, c = 1, d = 6

Q.2 (a) x = 3, y = -2, z = -1

(b)(i) 4
(ii) rt20 or 2rt5

Q.3 (a) x = 4, y = 2

(b)(i) ±6
(ii) -8

(c) Didn't take them down as they were all decimals.

Q.4 (a) 47/99

(b)(i) a = -42, d = 6
(ii) 0

(c)(iii) 27230

Q.5 (a) x = 2

(c)(ii) 47

Q.6 (a) x = 4/3

(b)(i) 2/5
(ii) line

(c)(i) [LATEX](-4-2xy^3)/(2+3x^2y^2)[/LATEX]
(ii) 2x + y - 6 is the tangent.

Q.7 (b)(i) 2/(1-2cosxsinx)

(c)(ii) minimum

Q.8 (a) -(cos2x)/2 + (e^4x)/4 + c

(b) 37 units

(c)(i) ln((1+sinb)/(1+sina))
(ii) ln((1+cosa)/(1+cosb))

THANK YOU
I do love you :P

I got pretty much the same answers and came out of the paper almost crying I was so sure everything was wrong!
These better be right...

Ashashi · 11-06-2010 05:58PM

Is that the real roots one? I did b^2 - 4ac greater or equal 0.

Then I got 16p^2 + 1 > 0

And I said that is p is real, and equal or greater than 0, it will always be greater than 0 due to the + 1, hence real roots.

It was a very project maths kind of question.

pn7xjrqy6fhta1 · 11-06-2010 05:59PM

hey lads...not one bit happy...tink i barely passed!!even failed..jus wondering do you get attempt marks for trying every question..

niamhocxox · 11-06-2010 05:59PM

mark.oc wrote: »

Q.1 (a) k = -3, t = 9

(c)(i) -3-b
(ii) -2-2b
(iii) b = -4, c = 1, d = 6

Q.2 (a) x = 3, y = -2, z = -1

(b)(i) 4
(ii) rt20 or 2rt5

Q.3 (a) x = 4, y = 2

(b)(i) ±6
(ii) -8

(c) Didn't take them down as they were all decimals.

Q.4 (a) 47/99

(b)(i) a = -42, d = 6
(ii) 0

(c)(iii) 27230

Q.5 (a) x = 2

(c)(ii) 47

Q.6 (a) x = 4/3

(b)(i) 2/5
(ii) line

(c)(i) [LATEX](-4-2xy^3)/(2+3x^2y^2)[/LATEX]
(ii) 2x + y - 6 is the tangent.

Q.7 (b)(i) 2/(1-2cosxsinx)

(c)(ii) minimum

Q.8 (a) -(cos2x)/2 + (e^4x)/4 + c

(b) 37 units

(c)(i) ln((1+sinb)/(1+sina))
(ii) ln((1+cosa)/(1+cosb))

You're answer to 1 (C) part (iii) is wrong cause they were 3 consecutive numbers......eg.1,2,3.....I got my answers as fractions with a difference of 1 between them all......

mark.oc · 11-06-2010 06:01PM

Ashashi wrote: »

Is that the real roots one? I did b^2 - 4ac greater or equal 0.

Then I got 16p^2 + 1 > 0

And I said that is p is real, and equal or greater than 0, it will always be greater than 0 due to the + 1, hence real roots.

It was a very project maths kind of question.

Not trying to be snide, but it was also a very "every maths paper since 1995" question.

Caught · 11-06-2010 06:01PM

Analia Acidic Wolf wrote: »

hey lads...not one bit happy...tink i barely passed!!even failed..jus wondering do you get attempt marks for trying every question..

If you do one step right you do.

Are we talking about the Junior?

mark.oc · 11-06-2010 06:02PM

niamhocxox wrote: »

You're answer to 1 (C) part (iii) is wrong cause they were 3 consecutive numbers......eg.1,2,3.....I got my answers as fractions with a difference of 1 between them all......

They weren't consecutive integers, they were three consecutive terms in an arithmetic sequence. There's a big difference.

Rothmans · 11-06-2010 06:02PM

Just had a look on examinations.ie, it seemed like a fairly tame paper. No majorly unpleasant surprises.

Caught · 11-06-2010 06:03PM

Ahhh. I clicked Leaving instead of Junior. I was wondering why everything looked so wrong.

Woops, sorry!

KealanOCarroll · 11-06-2010 06:04PM

Rothmans wrote: »

Just had a look on examinations.ie, it seemed like a fairly tame paper. No majorly unpleasant surprises.

easy to say when your not in the hotseat.....3 was ******* by and standards....nobody seemed to know 100% what the arg bit was about

KealanOCarroll · 11-06-2010 06:06PM

mark.oc wrote: »

They weren't consecutive integers, they were three consecutive terms in an arithmetic sequence. There's a big difference.

whole stack of people in my year did that too....i knew lookin at it that it didn say integers it said consecutive terms but i hadnt a nothion so i jus took a stab at callin them B=B, C= B+1 and D = C+ 1....hopin for attempt marks!

niamhocxox · 11-06-2010 06:09PM

How did everyone do question 1 (c) part (iii)

11-06-2010 06:10PM

Breezed through this

Needed the confidence boost after English yesterday.

SantryRed · 11-06-2010 06:11PM

Can't remember what b c and d equalled but just let u1= b, u2=c and u3=d.

And then do u3-u2=u2-u1

mark.oc · 11-06-2010 06:12PM

niamhocxox wrote: »

How did everyone do question 1 (c) part (iii)

c - b = d - c
(-3 - b) - b = (-2 - 2b) - (-3 - b)

Solve for b and fill in for c and d into the eqs you got for (i) and (ii).

chaoticmess · 11-06-2010 06:15PM

mark.oc wrote: »

c - b = d - c
(-3 - b) - b = (-2 - 2b) - (-3 - b)

Solve for b and fill in for c and d into the eqs you got for (i) and (ii).

*cries*
That's stupidly simple now I know what to do.

pn7xjrqy6fhta1 · 11-06-2010 06:15PM

Caught wrote: »

If you do one step right you do.

Are we talking about the Junior?

Leaving cert...iv looked at the answers nd it seems dat i only got bout 25 per cent of them rite...il tell u wat i did!!! in 1(c) i put x sqaured -x -2 into the equation...nd my answers were c=b-1 and d=2b-2...will i get attempts..in 3 b ii i put down 8 instead of -8 for the arg thing.. in the integration part i didnt do 1 bit of study on it so 4 the b parti worked out something nd got -32 for it...i crossed it out partily but will i get some marks still???im afraid the same thing will happen to me in paper 2!!!

ajjmk · 11-06-2010 06:19PM

Analia Acidic Wolf wrote: »

Leaving cert...iv looked at the answers nd it seems dat i only got bout 25 per cent of them rite...il tell u wat i did!!! in 1(c) i put x sqaured -x -2 into the equation...nd my answers were c=b-1 and d=2b-2...will i get attempts..in 3 b ii i put down 8 instead of -8 for the arg thing.. in the integration part i didnt do 1 bit of study on it so 4 the b parti worked out something nd got -32 for it...i crossed it out partily but will i get some marks still???im afraid the same thing will happen to me in paper 2!!!

exactly tha same as you...we better get some decent attempt marks..! :eek::p

Davidius · 11-06-2010 06:20PM

Had a look at the paper and thought it was a bit on the easy side. Hope this isn't the beginning of a trend oh wait project maths.

UglyFuc · 11-06-2010 06:21PM

did anynoe try solve the matrix by forming two simeltanoius equations?

Ashashi · 11-06-2010 06:22PM

mark.oc wrote: »

Not trying to be snide, but it was also a very "every maths paper since 1995" question.

Not really, usually, you don't need to explain, you just get (any no)^2 > 0.

TowlieMcD · 11-06-2010 06:23PM

Xevkin wrote: »

I thought the Higher paper was a cake walk with extra cake for all nothing unexpected, nothing challenging - apart from saying that the "curve" was a line :P

Agh ****! it WAS a line. is it the same thing if you say it only crosses the x axis once and that it has no turning points?? I think thats right...yes i think im ok...im trying to re-assure myself her

i though the paper was generally easy. what did everyone get for b,c and in q1?

Maths HL P 1 - aftermath

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