!! Maths HL paper 1 2016 - Before and After

pseudorachel · 10-06-2016 05:34PM

Oisin1001 wrote: »

Anybody know how to get the last part of Q8(b) where you have to get the formula for g(x), which is the path of the second basketball thrown? Think that was one of the two parts I didn't get worked out completely in the end.

thisis what i did anyway

let g(x)=aX^2 + bx + c

c is 2 because y=2 when x=0

sub in the point that was given to get one equation

g'(x)=2ax+c and sub in the max height

now you have simultaneous equations and solve. theres probably an easier way but that's what I did.

Leavingcert16 · 10-06-2016 05:34PM

Did anyone find the paper hard

CathalRyano · 10-06-2016 05:34PM

Oisin1001 wrote: »

Anybody know how to get the last part of Q8(b) where you have to get the formula for g(x), which is the path of the second basketball thrown? Think that was one of the two parts I didn't get worked out completely in the end.

Yep, so you sub in (x-0.5) as the x value in the formula, and you sub in (y+0.565) as the y in the formula. Gets you something like -0.273(x-0.5)x^2 + something(x-0.5) + something = y+0.565. And then you just simplify that.

randomlad727 · 10-06-2016 05:35PM

Oisin1001 wrote: »

Anybody know how to get the last part of Q8(b) where you have to get the formula for g(x), which is the path of the second basketball thrown? Think that was one of the two parts I didn't get worked out completely in the end.

I used the point of its maximum height and put it into the formula for when you complete the square (x-b)^2+c

Oisin1001 · 10-06-2016 05:37PM

DublinArnie wrote: »

I used the complete square method by using the turning point to form an equation, but I'm not sure if that's correct.

(x-h)^2 + K

Ah, I had the right idea anyway. Cheers

Didn't expect ten people to reply!

Appmaths97 · 10-06-2016 05:38PM

Oisin1001 wrote: »

Anybody know how to get the last part of Q8(b) where you have to get the formula for g(x), which is the path of the second basketball thrown? Think that was one of the two parts I didn't get worked out completely in the end.

i think you where supposed to replace y in the f(x) to y + translation of y coordinate, and replace x in the f(x) with x + translation of x coordinate.

You could also doing it by subbing in a few coordinates into ax squared + bx +c and solve for a,b and c

louisoc · 10-06-2016 05:39PM

If you start attempting something the right way, cross it out and do it the wrong way, does that negate any potential effort marks?

daraghwal · 10-06-2016 05:41PM

The papers are up on examinations.ie now

Wolframalpha is good for checking answers

Appmaths97 · 10-06-2016 05:45PM

how did you all do 1c? I did long-division and it got very messy

DublinArnie · 10-06-2016 05:46PM

Appmaths97 wrote: »

how did you all do 1c? I did long-division and it got very messy

Long divison worked for me.

For the basketball angles question, it said to the horizontal.

You guys who got answers in the 50s got it right.

I got the entry angle, not the angle to the horizontal.

onlinenerd · 10-06-2016 05:48PM

Such a nice paper

RC12397 · 10-06-2016 05:49PM

Anybody else get 40π for The rate that the radius is increasing?

DownOneTourist · 10-06-2016 05:57PM

do ye get something like -1+2i for 1c?
Also was the inverse function just 1 over (3x-2)?
Also for the differenciation question does 128pi/3 ring any bells?
I got 52 degrees in the acute question,
3.2 and 1.6
was question one a just the the complex conjugate?
anyone else get 0.15 for the slope of the curve?
also that javelin question was beautiful!

Edrees98 · 10-06-2016 06:01PM

It was a lovely maths paper but I made a few silly mistakes to be honest. Hopefully I got a low A2 or a B1.

Lee_la · 10-06-2016 06:03PM

Thought it was a lovely paper but after reading everyone else's answers here, I don't think it went as well as I originally thought..

DownOneTourist · 10-06-2016 06:04PM

Edrees98 wrote: »

It was a lovely maths paper but I made a few will mistakes to be honest. Hopefully I got a low A2 or a B1.

I feel the same. I definitely think that i got above 80 but i'm not sure by how much.

https://www.examinations.ie/tmp/1465577640_6345312.pdf Leela tell us what you got if you can remember!

Edrees98 · 10-06-2016 06:08PM

People are saying (3.2,1.6) for question 8(b) but it says distance. How could you get a coordinate???

DublinArnie · 10-06-2016 06:10PM

Edrees98 wrote: »

People are saying (3.2,1.6) for question 8(b) but it says distance. How could you get a coordinate???

No, part c wants the coordinates.

I got 8m for the distance. Idk if it's right.

pseudorachel · 10-06-2016 06:10PM

Edrees98 wrote: »

People are saying (3.2,1.6) for question 8(b) but it says distance. How could you get a coordinate???

that's for part c.
part b is the limited at infinty of the sum of the series which was 8.

legocrazy505 · 10-06-2016 06:13PM

Just after roughly allocating marks and probably got a B3 or somewhere around that. Will need to make sure paper two secures a B at least since a B3 is required for my first choice.

onlinenerd · 10-06-2016 06:13PM

pseudorachel wrote: »

that's for part c.
part b is the limited at infinty of the sum of the series which was 8.

You are referring to question 9 I think

DownOneTourist · 10-06-2016 06:14PM

8 is the distance 4 over 1-1/2 i think is what i had

Edrees98 · 10-06-2016 06:15PM

pseudorachel wrote: »

that's for part c.
part b is the limited at infinty of the sum of the series which was 8.

I got 8, soo am I right??

louisoc · 10-06-2016 06:16PM

DownOneTourist wrote: »

do ye get something like -1+2i for 1c?
Also was the inverse function just 1 over (3x-2)?
Also for the differenciation question does 128pi/3 ring any bells?
I got 52 degrees in the acute question,
3.2 and 1.6
was question one a just the the complex conjugate?
anyone else get 0.15 for the slope of the curve?
also that javelin question was beautiful!

I'm pretty sure it was 1-2i for that complex num q

MashedPotato49 · 10-06-2016 06:16PM

Yep

DownOneTourist · 10-06-2016 06:21PM

louisoc wrote: »

I'm pretty sure it was 1-2i for that complex num q

you might be right. I remember the numbers and that was a minus sign somewhere. I divided a Z factor into the Z squared equation and got a root from the factor at the top

louisoc · 10-06-2016 06:27PM

DownOneTourist wrote: »

you might be right. I remember the numbers and that was a minus sign somewhere. I divided a Z factor into the Z squared equation and got a root from the factor at the top

I just did it there and 1-2i fits z^2 - sum + product. My chemistry teacher was going through the exam afterwards and he said there were about five different ways of doing that q

Lee_la · 10-06-2016 06:28PM

For Q1 (b) and (c) I got something + 0i
For the inverse function I got (x+2) over 3
For the rate the radius increases I got 5/32pi
For the rate the surface area increases I got 40000pi
For the average height of the ball I think I got 166.667
For the acute angle I got 1 degree which I obviously went wrong with :')

Heyzelx · 10-06-2016 06:29PM

Pure babe of a paper!!!!

DownOneTourist · 10-06-2016 06:30PM

louisoc wrote: »

I'm pretty sure it was 1-2i for that complex num q

Lee_la wrote: »

For Q1 (b) and (c) I got something + 0i
For the inverse function I got (x+2) over 3
For the rate the radius increases I got 5/32pi
For the rate the surface area increases I got 40000pi
For the average height of the ball I think I got 166.667
For the acute angle I got 1 degree which I obviously went wrong with :')

well i got your average height! And i think i did the inverse function wrong. Can anyone explain how to do that inverse. and i totally did the radius rate and suface area questions wrong

!! Maths HL paper 1 2016 - Before and After

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