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AQA C1 Unofficial Markscheme

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Reply 120

Sniperdon227

K=-30 100%

Original post by Alfieeee11

Are u sure k wasn't -30

Reply 121

username2592579

Original post by 28657

I got sqrt65 as well. Did you find it by using pytharogas or substituting point A into the equation?

i dont know if my method was the same
but i found it by working out the difference in co-ordinates between C and A and then squared them and square rooted and i got root 65

Reply 122

BlackthornRose

Original post by timtjtim

No, y=8

I drew this but did not state the x intercepts as it didn't say to do so, do you think I will lose marks? I got the y intercept and which quadrant it turns in correct though.

Reply 123

df97

Original post by BlackthornRose

Yes it did, thank you very much. I also just reworked it out for myself and you are correct. That's another mark gone for me.

Don't worry, you'll only lose one mark and if I'm honest I actually put negative too until I changed it at the last minute. I'm sure you'll do great! :biggrin:

Reply 124

money-for-all

Original post by Sniperdon227

Mate you had to use the distance formula or place the number in the eq to find k (=r^2)

dont lie bruv, i know what you did last summer fam.

ITS ROOT 34 BRUV

Reply 125

xs4

Original post by Alfieeee11

Are u sure k wasn't -30

k+30= 0
therefore k=-30 mate

Reply 126

money-for-all

Original post by konanabanana

nope

root 65

you are a banana peeel

Reply 127

ALI7861105555555

how many marks was the circle question ?

Reply 128

BlackthornRose

Original post by Alfieeee11

Are u sure k wasn't -30

I also got k=-30 and checked my answer by finding what the x and y coordinates would be if k was -30 and whether it would then satisfy the equation and it did.

Original post by Sniperdon227

K=-30 100%

Thank you that's very reassuring, i always begin to doubt myself when i see differing answers.

Reply 129

BlackthornRose

Original post by df97

Don't worry, you'll only lose one mark and if I'm honest I actually put negative too until I changed it at the last minute. I'm sure you'll do great! :biggrin:

Thank you

I'm only worried because I also made a mistake in finding the area of shaded region (got the area under curve (20.25) but not triangle and then ultimate answer was incorrect), how many marks do you think i lost there?

Reply 130

timtjtim

Original post by money-for-all

dont lie bruv, i know what you did last summer fam.

ITS ROOT 34 BRUV

Naw, man it's √65 bruv.

Take a gander at the attached snap.

circle.png23.9KB

Reply 131

money-for-all

Original post by timtjtim

Naw, man it's √65 bruv.

Take a gander at the attached snap.

i know your lieing tim tim, stop foooling around like jhon

ITS ROOOOT 34 FAM.

Reply 132

matt_2605

Original post by TheGreatPumpkin

I got sqrt(55), but I added up the numbers incorrectly it should have been sqrt(65).

I did the same :frown:

, the error carried through to the CT length question as well. How many marks do you think having sqrt(55) as the radius will lose in total?

Reply 133

timtjtim

Okay guys, let's try and collate a better mark scheme now. If you are confident you know the Question Part, and the answer, please reply / add a post below. If you want to know more about your answer, try asking at the other AQA maths forum.

http://www.thestudentroom.co.uk/showthread.php?t=4077801&page=14&p=64916221&posted=1#post64916221

Reply 134

milen123

What did u guys get for the translation by vector question? translation by vector 0.5/-41/4?

Reply 135

Alfieeee11

Does anyone think mid 40s could be a c this year as it has been for other years.

Reply 136

xs4

http://www.thestudentroom.co.uk/showthread.php?t=4095491

^^^special cloth alert

Reply 137

xX_babefire_Xx

Original post by Sayless

I got 81/4 for the first part, then 45/4 for the second part, I think, something like that, area of triangle is 9.

I got 81/4 and 45/4 too!!

Reply 138

toml95

Stupid mistakes cost me this paper, and nerves, was incredibly nervous. My working was basically all correct from what I'm reading here I just made small errors which ****ed me big time apparently.

Feel so ****.

I got root 34 as well.

But it's pretty obvious they give you C (5, -3) and A (-2, 1)

so you get (x-5)^2 - 25 + (x+3)^2 - 9 = 0 Most people think thats the equation therefore the radius must be 34, but pretty sure if you like at general equations of a circle if you did it with just the co ordinates of C the radius would always be wrong as it's not included in the question, that's why A was included, it's on a point of the circle...

So 7^2 + 4^2 = 65 which is the radius^2 therefore SQ root of 65 is the answer for the radius.

Kicking myself in the teeth for so many questions.

Ah man I think I'll get a borderline B for this, gotta try and wreck the C2 exam..