Think about it this way. From (x+1)^2 +y^2 = 49 to (x-5)^2 + (y+7)^2 = 49, the co-ordinates of the centre of the circle move from (-1, 0) to (5, -7). This implies a shift to the right of 6 units in x and 7 down in y. This is represented by the vector [6, -7]. Hope this helps.

Reply 126

wanjianyi

and there is a question to ask u find that angle in radians, u just make your calculator into ike radian mode and do sin rule dont u

Reply 127

Lauraloo1

Original post by ash9002

How many marks was the u3 question worth???

I think it was 2

Reply 128

Lauraloo1

Original post by wanjianyi

and there is a question to ask u find that angle in radians, u just make your calculator into ike radian mode and do sin rule dont u

Yep, and because it was an obtuse angle, you had to take the original answer away from 180 degrees. I think i got 1.7 or something like that :smile:

Reply 129

ash9002

Original post by Lauraloo1

I think it was 2

Will just drop one mark for putting in 3/2 instead of 2/3 then? Got 116 instead of 56 as a result of that :/

Reply 130

Equality4all

Original post by $oulja

for my translation, i don't remember what i put... either (-6,7) or (6,-7). i think i'd lose 1 mark there if i got that wrong. thinking of it now, i think i actually did put (6,-7) can only hope for the best now.

By merely stating translation you will get a mark, unless if they specified it was a translation in the question, which I don't think thy did. Hope you get the grade you want man.

Reply 131

username1086199

Original post by Equality4all

Think about it this way. From (x+1)^2 +y^2 = 49 to (x-5)^2 + (y+7)^2 = 49, the co-ordinates of the centre of the circle move from (-1, 0) to (5, -7). This implies a shift to the right of 6 units in x and 7 down in y. This is represented by the vector [6, -7]. Hope this helps.

i think you are right as i might have read the question wrong so did the translation backwards and got (-6, 7)

Reply 132

Lauraloo1

Original post by ash9002

Will just drop one mark for putting in 3/2 instead of 2/3 then? Got 116 instead of 56 as a result of that :/

aww that sucks :frown:

hopefully they'll give you a mark for method :wink:

Reply 133

Adam_Pritchard

Original post by ash9002

Will just drop one mark for putting in 3/2 instead of 2/3 then? Got 116 instead of 56 as a result of that :/

How did you show that p was 3/2

Reply 134

dannyb2012

U know for the 9th question of tanx=-1 my teacher said do the inverse of the positive value only so i did and got 45degrees so i got 180 - 45 and 360 + 45, X = 135, 405 Anyone else remember this and then for the very last one i got summit like 14degrees and cant remember the other 2 values U had to factorise i got summit like (3cos(theta)-2) (2cos(theta)+3) Anyone else confirm or better ?

Reply 135

Lauraloo1

In core 2, what was the answer for the transformation question with (2,-0.9) I forgot the numbers :/

Reply 136

OHNOGEM

15

Hi does anyone remember the 'K' question i remember getting 2^3 at the end but i can't remember the exact Q.. anyone else get 3? :s-smilie:

Reply 137

Adam_Pritchard

Can someone please do a mark scheme with questions please

Reply 138

Equality4all

Original post by Alifff

i think you are right as i might have read the question wrong so did the translation backwards and got (-6, 7)

Unless I misread the question aha :P I had 50 minutes or so to check my work and the wording of the questions, so I do hope I haven't messed that one up. How do you think you did overall?

Reply 139

Denacio

8

Original post by Sweatynerd

Hey guys this is about the c1 exam, can anyone explain the answer to the complete the square one where there was a coefficient in front of the x? Like the question at the end where it said out it in the format 1/2root m (which is an integer)??? Or at least say what they got? Cheers

you had 2x^2+6x+5=0. 2(x^2+3x)+5=0
so complete the square for X^2+3x gives you (x+3)^2-9
so final is: 2(X+3)^2-4=0 as -9+5=-4.

should of gotten 1/2root5.

AQA Maths Core 1+2 May 2013

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