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.

Reply 106

HazNut134

Original post by tajtsracc

It should be 0.5 and positive 41/4 for the translation, shouldn't it?

That's what I got

Reply 107

User2422333

What was the area under the curve as a fraction

Reply 108

Poppy1098

Original post by Hbassett26

I got it too! Don't really get how it could be anything else! :frown:

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

Reply 109

haza01

Original post by ella-1997

Im pretty sure i used the discriminant (b2- 4ac=0 as it was a tangent and therefore only one solution) and it produced the quadratic equation k^2 + 24 +80 or something along those lines and then just factorised it

thats exactly what i did

Reply 110

Fambox

Original post by R7499

Just under a week to go... How's everyone doing?

Why was the numbers so hard on c1 don't they know it's non calculator 😳

Reply 111

Parhomus

Almost thought 45 x 7=305 :P Would've messed up surds if I didn't realise than 290/4=/= integer.

Reply 112

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?

Reply 113

tajtsracc

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.

Reply 114

ablackburn

Yes, unless we are both wrong :frown:

Reply 115

Hbassett26

Original post by Poppy1098

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

Think I got root 50! Think even if we did get root 34 wrong we should get error carried forward for the later question!!

Reply 116

JStebz

Original post by cerealisyummy

Yeap, I got that as well

I left it as -2+-root10 i think, but from what I remember i didn't divide it because if you half root 10 you get root2.5 which isn't an integer

Reply 117

Rajhi98

To find k did anyone else use b^2-4ac=0 ?

Reply 118

Pingu7

Original post by Ordo

I wasn't sure so I put translation through (0.5, ?)
I think I would get 2/3 marks

Igot -0.5 because I sketched the curves and it moved left

Reply 119

musslih

Original post by jordanwu

I got root 34 for the radius as well.. I'm so confused.. The centre of the circle was given as (5,-3) so (x-5)^2 + (y+3)^2 = 25+9 .....

Hmmmm i'm not sure which is the correct answer, but after finding the length of AC, I've got root 65 as A is on the circumference of the circle, so by finding the length from the centre to the circumference, we're actually calculating the diameter, which was root65, but the final answer is just =65 (RHS)

hope it helped