Maths Paper 1

Raphael

Funkstard wrote:

I thought honours paper 1 was pretty shocking.....everyone else seemed to also. Q5 c) I didn't get out, I got a result different to the one shown above. The graph in question 6....I had my points but I didn't have a clue how to draw it.

I got 3 a) wrong too! It was the 'real' part that confused me, because I didn't think you coulc let it equal to a + 0i.

2 b)ii) what was your explanation on why the roots were real? I said that since t was an integer, the expression could be positive or negative, ie. it was on either side of the x-axis -> curve cuts the x-axis -> real roots.

Realised afte though that it almost definitely followed from the b^2 - 4ac thing in i) though.

Overall not that happy with it, especially as Maths is one of the subjects I need to do well in

Well in b (i) i got that the roots were real when they were less than 0 and greater than 8/9. So all integers fit those requirements.

Did anybody get 2C?

still trying it here and getting nowhere!!

easily the most infuriating question on the exam as looked easy enough but was far from it!

(Honours)

shane0312

Gangsta wrote:

you use the b^2-4ac result in Q2. B ii) also. 9t^2>-8t and if t is an integer that statement is always true.

Therefore, the roots are real.

It was all based on the fact that if you square a non-integer as in a fraction it gets smaller and therefore could make the result<0

helles belles

helles belles wrote:

yeah there is a russian math genius in my school (he is ACTUALLY a genius), and he thought the paper was quite hard. he still thinks he got an A1 though:rolleyes:

same here...

which is actually really good, cause if you reckon you've done that well when others haven't, you're bound to be doing well!

Raphael

Deleted User wrote:

Did anybody get 2C?

still trying it here and getting nowhere!!

easily the most infuriating question on the exam as looked easy enough but was far from it!

(Honours)

I got a nasty looking log for that, -(1/2)logb(b+1)

bobneedshelpnow

i was the only one happy coming out of that exam , i loved it def got full marks in Q1 and complex numbers-though the rest were tricky so its hard to know
well passed paper 1 and now now its cram cram study for paper 2

Gangsta

true that...got my head itching for a few mins;)

shane0312

Deleted User wrote:

Did anybody get 2C?

still trying it here and getting nowhere!!

easily the most infuriating question on the exam as looked easy enough but was far from it!

(Honours)

Yeah I think I did, I used logs.

Raphael

shane0312 wrote:

It was all based on the fact that if you square a non-integer as in a fraction it gets smaller and therefore could make the result<0

What did you get for b(i)?

shane0312

Raphael wrote:

I got a nasty looking log for that, -(1/2)logb(b+1)

Exactly what I got:D
Edit: Except my answer was a natural log.

Raphael

shane0312 wrote:

Exactly what I got:D

Score. I moved the minus a half inside the log though and turned it into a root with a power of -1 because it looked tidier though =D

helles belles

ok i thought the matrices and complex numbers question was ok (apart from pt (a))
now im starting to get worried!!!!!:eek:

Attractive Nun

Funkstard wrote:

2 b)ii) what was your explanation on why the roots were real? I said that since t was an integer, the expression could be positive or negative, ie. it was on either side of the x-axis -> curve cuts the x-axis -> real roots.

Realised afte though that it almost definitely followed from the b^2 - 4ac thing in i) though.

Yeah the range of values I got for it to be negative were -8/9 and 0, i think, and since and that range contains no integers (it was less than or equal to, dealing with the 0) then the integers had to be positive. Obviously that's a terrible explanation, but I can't really remember the question, that's the jist of it though.

shane0312

Raphael wrote:

What did you get for b(i)?

I cant remember exactly but I think it was 9tsquared - 8t or something.

helles belles

yeah i got that 2 shane

godfather69er

****ing biatch of a paper recognised nothing, when i saw 1 a i starting singing livin on a prayer i was ****tin myself, i reckon i recovered well to take about 125 marks so i better get on ta paper2 at least there is a bit of procedure to it, scarily like my mock paper which the school never gave us back!!

Raphael

shane0312 wrote:

Exactly what I got:D
Edit: Except my answer was a natural log.

A natural log? Did you get a lod of both sides to start then? My method:

1=b^(2x) (b+1)
1/(b+1)=b^2x
logb(1/b+1)=2x
x=1/2(log1-log(b+1))
x=-1/2log(b+1)

shane0312

shane0312 wrote:

I cant remember exactly but I think it was 9tsquared - 8t or something.

yeah

and then you graph it and you have -7/8 <(or=) t <(or=)0

Raphael

Deleted User wrote:

yeah

and then you graph it and you have -7/8 <(or=) t <(or=)0

Which includes no integers! QED

Although I had 0 and 8/9...

shane0312

helles belles wrote:

yeah i got that 2 shane

Yeah now all we need is a nice paper 2

yes indeed, fat fingers
(-8/9)

helles belles

which did u think was harder, this years or last?

Raphael

Deleted User wrote:

yes indeed, fat fingers
(-8/9)

Ah, i left out the minus from the -4ac. Probably only a slip though, I hope.

Edit: Last years, by far

sariane

do they ever post up the marking schemes?? i wanna see how i did!

eamoss

Was lookin back over the paper think I made a big mistake!

In complex numbers Q4 part(b)(i)
Slove z2 -4z +29 in the form x + yi how did you do it? Did you use (z + )(z - )??

mang87

I got raped by the pass maths paper

Raphael

sariane: Not for quite a while

eamoss: What was the full question? Don't have an ordinary paper...

GrumPy

mang87 wrote:

I got raped by the pass maths paper

Me two. Even though my intention was to be the r4pist.

eamoss

http://www.examinations.ie/archive/exampapers/2006/LC003GLP100EV.pdf

mang87

Irish GrumPy wrote:

Me two. Even though my intention was to be the r4pist.

It was awfull... Apparently a few people in my school are officialy complaining to the board about it