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HL paper 1 answer discussion
by aimer Leaving Cert Mathematics — 11/06/16 42

Did anyone get 10 as the answer for x for the triangle? And did anyone know what to do for the Pythagorean triplet part??


42 Comments
jack.nugent.12 — 10/06/16
I got 10, you had to fill in 10 for x and prove it worked
aimer — 10/06/16
Ohhh I feel stupid!
aimer — 10/06/16
I just subbed the 10 in I didn't prove it worked though, hopefully I'll get some marks though
Aaron125 — 10/06/16
10 didnt equal, 0 did though
CaolanH — 10/06/16
I got 8.2..
aimer — 10/06/16
10 did work though. I got 1 and 10 but if 1 was an answer you wouldve gotten a side with length 0
Aaron125 — 10/06/16
10 only worked if you squared the 4 with the x which you don't do when you have the variable (10) though
BebGoldof — 10/06/16
I'm not sure why everyone is so happy with the paper. It was much more difficult than the previous 2 or 3 years. Did everyone get 8 and 13 for the bees question?
Aaron125 — 10/06/16
yea you could check the answers with that long formula at the end
BebGoldof — 10/06/16
the 200m sprint question was incredibly easy marks too but I despise rates of change
aimer — 10/06/16
Did anyone else find that that new equation that have us didn't make any sense? I had No idea how to use it so I just counted��
BebGoldof — 10/06/16
I dunno but I realised I fucked up the simultaneous and Pythagorean triple Qs which is annoying but it could've been worse
dard — 10/06/16
what did people get for the acute angle for the bastball net?
CaolanH — 10/06/16
29 degrees
dard — 10/06/16
did you just use the derivative to get the slope at the basketball net had use 1 for the horizontal slope then the tan formula?
shannon8 — 10/06/16
Think I got 34 degrees or there abouts
aimer — 10/06/16
I got 32��
aimer — 10/06/16
I got 32 I think��
aimer — 10/06/16
Did anyone else find that the BEE equation they gave us didn't make any sense? I had No idea how to use it so I just counted��
shannon8 — 10/06/16
Could've been 32 I got! How did you do it? I couldn't understand how to work out the bee formula so I extended the diagram thing to find G6 and G7, hopefully get a few marks for it anyway haha
dard — 10/06/16
i just used the last formula they gave you it worked but i didnt show subbing into the first formula
aimer — 10/06/16
I draw a triangle from C to the max point, then down to the horizontal i drew from C, left. i got the Y value (opposite) by taking the Y coordinates away (C and max point ) then the X coordinate(adjacent ) the same way , then worked out tan to get the angle. Not sure if that's what you were support to do though
aimer — 10/06/16
*drew
aimer — 10/06/16
Anyone else do it like that?
Aaron125 — 10/06/16
I did something similar but then I was told it was wrong because that gives you the angle if it were a straight line and not a curve :L
ronanomalley — 10/06/16
i got 52 degrees by using the dy/dx of the parabola that you worked out in the previous part and using the x value of the point at the net. you get the slope of the tangent at that point then sub that into the acute angle between two lines formula using 0 as the second slope because its the slope of the x axis and you come out with an answer of 52 degrees or something along those lines
louisoc — 10/06/16
the angle was 52, you got the slope using f'(x), then did the tan^-1 of that, which gives you 52
shannon8 — 10/06/16
Ah I think i did that, so you let the angle equal the tan inverse of the y coordinate of the hoop over the x coordinate?
Lc8/6/16 — 10/06/16
Fairly tight on time as well. Nasty paper I thought
exam — 10/06/16
I got 52 too ronanomalley and louisoc even though the whole world is saying 32
PCM123 — 10/06/16
Also got 52
PCM123 — 10/06/16
What about the trig differentiation question
CaolanH — 10/06/16
Lol how the hell did I get 29
exam — 10/06/16
I got .15 for the slope in the trig differentiation but I wasn't sure to use pie or pie in radian form
anonymous1234 — 10/06/16
BebGoldof. I got 8 and 13 as well and these are right because when you do a trial in the bottom in the formula this is what you get.
jozx7r — 10/06/16
I got 52 as well but I think it's wrong? I done the horizontal from A, but the Q was the horizontal from when it went into the hoop .. maybe the two answers are the same though!
Fjfj — 10/06/16
I got 52° as well by using first derivative as slope and subbing in value of x=4.5 and then used tan inverse to solve
What did people get for the trig differenciation question?
aimer — 11/06/16
I think mine started off with -1/xcos (1/x) something like that but I cant remember
Chloe murphy686 — 11/06/16
I'm just curious but I did my simequations twice and I still got the same decimal figures anyone else get decimals. All and all the paper was manageable way easier than the pre papers
Fjfj — 11/06/16
I got sin(1/x) - (1/x)cos(1/x) i think
Alexw — 11/06/16
ye i got that too using product rule
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