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AQA A Level Maths Core 2 - 25th May 2016 [Exam Discussion]

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Original post by goofyygoober
the least value is 2 because the least value for cosx is -1.
Therefore, 5+3cosx=2
cosx=-1
and you can solve


Argh silly I didn't see that. Thanks
Original post by nayo-nica
how many marks was 9a. worth?

4marks
Original post by tajtsracc
The 3rd transformation question was a stretch in the y-direction by a scale factor 3, right?

Also, as someone else asked, how many marks are lost if you didn't do anything correct beyond 5 + 3cosθ?


Stretch in y-direction by sf 3 is correct!!!
What did you guys get for the coefficient of X^10? I got something like 1648
Also, what did you get for the perimeter for the triagnle/sector thing?
Original post by goofyygoober
Stretch in y-direction by sf 3 is correct!!!


That's good, I saw someone post earlier that it was an x-direction stretch by s.f. 1/3 and I started worrying lol
Also, on the first question for part B I got the wrong answer but got the method right I think, would that still get 2/3?
Original post by salome12
What did you guys get for the coefficient of X^10? I got something like 1648
Also, what did you get for the perimeter for the triagnle/sector thing?


Ye -1648

And 13.8
Original post by salome12
What did you guys get for the coefficient of X^10? I got something like 1648
Also, what did you get for the perimeter for the triagnle/sector thing?


My answer was in minus?
What did you find for the value of k? Does anyone remember?
Original post by MotorboatMyGoat
Argh silly I didn't see that. Thanks


To be honest, it was a poorly worded question in my opinion, I wasn't sure what they meant by "least possible value", good thing I did assume it meant the lowest possible value, so I got the value as 2 and x=pi.
Original post by salome12
What did you guys get for the coefficient of X^10? I got something like 1648
Also, what did you get for the perimeter for the triagnle/sector thing?


I got -1648 and the perimeter one I got 13.8(3s.f)
Original post by tajtsracc
That's good, I saw someone post earlier that it was an x-direction stretch by s.f. 1/3 and I started worrying lol


I Wrote that but it's wrong, the reason it is 1/3 in x is because you would get ( (3x)^2+9)^1/2 which you can then factorise out the nine and when you square root it, gives u the new expression with the three on the outside.
Original post by tajtsracc
My answer was in minus?


Mine was negative too .in the thousands
Original post by Loukia98
What did you find for the value of k? Does anyone remember?


11/2
Original post by Bradley99
Also, on the first question for part B I got the wrong answer but got the method right I think, would that still get 2/3?


What is the question about?
Original post by goofyygoober
I got -1648 and the perimeter one I got 13.8(3s.f)


Nice, I got both of those too, looks I'm on track for a strong A-grade then!
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Original post by goofyygoober
I got -1648 and the perimeter one I got 13.8(3s.f)


Oh yeah that's what I meant 😊
I think I got the same for the perimeter too .
Wasn't K = -5.5 as the tangent was to the left of the max point?
Original post by Parhomus
I Wrote that but it's wrong, the reason it is 1/3 in x is because you would get ( (3x)^2+9)^1/2 which you can then factorise out the nine and when you square root it, gives u the new expression with the three on the outside.


What is the original function for x?
Is it (x^2+9)^1/2 or (x^2+1)^1/2?

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