AQA A Level Maths Core 1 - 18th May 2016 [Exam Discussion]

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I'm pretty certain radius is root 65. Then for the last question, you use pythag, 65 + 16 = 81, square root of that gives you a solid 9.

no i got root 34

Reply 121

yasaminO_o

Original post by Poppy1098

Exactly!! Because -25-9 is -34??
Also what did you get for CT?

You work out k (or r^2) by finding the distance of CA squared, which was (-5-2)^2 + (3- -1)^2 = 7^2 + 9-4)^2 =65

I got 9 for CT by doing (√65)^2 + 4^2 = 81, then √81 = 9

Reply 122

Ordo

Original post by melanin101

How are you guys getting root 34 for the radius?? I got root 65 by using Pythagoras to find the length of the centre to the point they gave us...

root 34 people, what did you get for the length CT?

I realised I got it wrong radius root34
CT question I put root50
hope they give us marks for method

Reply 123

Fambox

Original post by WhiteTigerKURD

I got 11.25

I got the same I hope we are right !!! Mine was in fraction form like 135/12

Reply 124

jordanwu

Original post by Parhomus

The method you talk about is when you have something like ax^2+bx+cy^2+dy=k
I almost did the same thing but then when I plugged in coordinates and realised it was wrong I saw you had to find the radius from A and C and it gave you sqrt65.

Fml, imo this paper was harder than last year's because there were so many questions where you could make mistakes on. Do you remember what the coordinates of A were?

Reply 125

Poppy1098

Original post by yasaminO_o

You work out k (or r^2) by finding the distance of CA squared, which was (-5-2)^2 + (3- -1)^2 = 7^2 + 9-4)^2 =65

I got 9 for CT by doing (√65)^2 + 4^2 = 81, then √81 = 9

Ahh thank you, that makes sense! Will I get an error carried forward for the CT question then?

Reply 126

piggywag1

I got 9.

Posted from TSR Mobile

Reply 127

tajtsracc

Original post by moe889

no i got root 34

I'm sure it has to be root 65. What was your CT? I got √81 = 9, which can't be a coincidence.

Reply 128

hlincoln

Can you still get marks on the integration if the answers was wrong?? Like method marks

Reply 129

euan__

Original post by Jacobisswaggy

For the coordinates of Q, I don't think I wrote (-5/4,0) I just wrote -5/4 - did you have to give the full coordinate? It was obvious that y was 0 :/

only had to give the x value

Reply 130

kylabaebae

Original post by haza01

thats exactly what i did

Yeah same except it came out as k2-24k+80 so (k-20)(k-4) giving k=20 and k=4

anyone else get that?

Reply 131

yasaminO_o

Original post by Poppy1098

Ahh thank you, that makes sense! Will I get an error carried forward for the CT question then?

From looking at past mark schemes I'm sure you'll get the method marks but you probably won't get the final answer mark :frown:

Reply 132

moe889

Original post by tajtsracc

I'm sure it has to be root 65. What was your CT? I got √81 = 9, which can't be a coincidence.

i think youre wrong mate. i got 9 aswell

its all ogre now

Original post by kylabaebae

Yeah same except it came out as k2-24k+80 so (k-20)(k-4) giving k=20 and k=4

anyone else get that?

I got that :smile:

Reply 135

tajtsracc

Original post by hlincoln

Can you still get marks on the integration if the answers was wrong?? Like method marks

Yeah I messed up aswell. But luckily I got the area of the triangle right, 9, which is one mark (looking at past papers). One mark for integration and one mark for substituting x into the integrated formula. I mentioned "intergral - area of triangle" which I'm not sure counts, but if it does then that's 4/8. Not too bad.