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    Is there an edexcel unofficial mark scheme anywhere,
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    Can anyone remember the equations they gave for the surds? i remember getting 7-root5 instead of 7+root5
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    (Original post by sohail90)
    Can anyone remember the equations they gave for the surds? i remember getting 7-root5 instead of 7+root5
    The coordinates were something like (√3, 2√3) and (√5, 4√5) with the answer 7 + √15
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    (Original post by ell98)
    For the circle question did it say to write the radius in the form n root something because I have just read that the equation was in the form (x-a)^2 + (y-b)^2 = d which would mean that the diameter was 50 so the radius would just be 25?


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    d does not represent the diameter. It represents the radius squared. So the radius is the square root of 50 which can be simplified into the surd form of 5 root 2.
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    (Original post by -jordan-)
    d does not represent the diameter. It represents the radius squared. So the radius is the square root of 50 which can be simplified into the surd form of 5 root 2.
    Oh that's alright then haha


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    What would a B likely to be?
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    (Original post by stabulo)
    x^2(x-3) there is a repeating root at x = 0, and it passes through x = 3
    so it touches x = 0 not goes through.
    yeah realized afterwards i made such a stupid mistake(well worse than a mistake) i ignorantly drew a quadratic going through x=0 and x=3 felt like shooting myself.

    you know for the question where you needed to find dV/dt, if you differentiated it wrong but did the next part of the question (find stationary and if max or min) (4Marker) would you get error carried forward marks?
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    (Original post by sohail90)
    Can anyone remember the equations they gave for the surds? i remember getting 7-root5 instead of 7+root5
    You got 2 pairs of coordinates, not an equation. And it should also be root15 not root 5 (comes from root3 multiplied by root5). Afraid I can't remember which numbers they gave though.

    Edit: You may even be right with the 7-root15, as thats what I remember getting...
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    (Original post by starfish5577)
    On the cylinder question who got 4 for the stationary point ?
    Thats correct
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    do you still think you'd 3 out of 3 for the simultaneous part in q1 if you got the right answers for x and y but didn't put them into co-ordinate form?
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    On the integration question where you had to find the area of the shaded region, I did it all correctly except when working out the area of the trapezium I used the area of the triangle plus the area of the rectangle, and forgot to add the area of the rectangle, so I did 36- 108/5 instead of 54. How many marks do you think I'll lose for that? I have the area of the trapezium written down I just made a stupid mistake!
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    (Original post by ImLiterally12)
    I ended up rushing the cylinder question in about 5 mins at the end, but somehow I got to the given answer. I worked out an equation for the surface area (Which i think was given as 49π?):

    49π= πr^2 + h(2πr) where h is the height of the cylinder and 2πr if the circumference.

    I then worked that through to make h the subject. For part b I worked out the volume to be V=2πr^2 x h and substituted in the equation for h from part a.

    Hope that makes sense, I found the paper to be harder than most of the past papers I did so I think grade boundaries might be higher than usual.

    Hope everyone gets the grade they wanted!

    You mean Grade boundaries should be lower right?
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    (Original post by l1lvink)
    You got 2 pairs of coordinates, not an equation. And it should also be root15 not root 5 (comes from root3 multiplied by root5). Afraid I can't remember which numbers they gave though.

    Edit: You may even be right with the 7-root15, as thats what I remember getting...
    It was definitely plus. The form was n + √15 not n + m√15 for example, where m would be -1. My previous coordinates, (√3, 2√3) and (√5, 4√5) give this answer too.
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    For the intergration one did anyone make the denominator over 15 instead of 5?
    Would i still get a mark. it should still be the same answer right?

    And aldo for the simultaneous equation i got fractions :confused: i was so confused because simultaneous equations are usually really simple for me and i was sure my answer wasn't right. so I did it again and did it really slowly and still got fractions :confused: Does anyone remember the two equations so i can try it again now?
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    (Original post by student0042)
    The coordinates were something like (√3, 2√3) and (√5, 4√5) with the answer 7 + √15
    Pretty sure it came to (-14 - 2root 15)/(-2) which becomes 7 + root 15
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    (Original post by rhoxc)
    For the intergration one did anyone make the denominator over 15 instead of 5?
    Would i still get a mark. it should still be the same answer right?

    And aldo for the simultaneous equation i got fractions :confused: i was so confused because simultaneous equations are usually really simple for me and i was sure my answer wasn't right. so I did it again and did it really slowly and still got fractions :confused: Does anyone remember the two equations so i can try it again now?
    I think I got 9 and -2
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    (Original post by RhyaCeri)
    its 5x? i think, im not sure, pretty sure im gonna have nightmares about that cylinder question tonight though
    Well this cylinder question basically ruined the exam for me. Spent about 20 mins wondering why I couldn't do it. Then realised 2 mins before the end that the surface area = 48pi and not 48.

    Drew the cubic sketch as quadratic. (**** me)

    Wrote the integral as 108/5. Didn't want to mess with fractions so I wrote it as 21+3/8 pulling the /8 out of my ass. (**** me again)

    Somehow got -31/3 and some other fraction for the simultaneous, although I had the right equation, from what I see posted here.

    Panicked on the last quadratic because I couldn't see the factors to -144 and tried to brute force the quadratic formula, but of course in my panic made numerous addition and multiplication errors.

    Well, all I have to do now is get 100% on C2 and S1 and I'm fine. Easy, peasy........
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    (Original post by -jordan-)
    Pretty sure it came to (-14 - 2root 15)/(-2) which becomes 7 + root 15
    It would be minus if you did y1 - y2/ x... I did it the other way round, which kept it positive anyway.
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    (Original post by Rk2k14)
    What would a B likely to be?
    Last 3 years it has been 55, 59, 55. So i'd say between 55 and 60. May be closer to 55 mark this year due to that lovely cylinder question.

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    I messed that up on the simple part
 
 
 
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