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OCR (not MEI) C1 - Wednesday 13th May 2015 Watch

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    (Original post by Simonium1010)
    With this curve, a stretch of scale factor 1/3 is identical in both directions
    Me and my friend were saying it's an odd function so both are acceptable?
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    (Original post by Parallex)
    -1/48 is the answer man

    (8)^{4/3} and (-8)^{4/3} both equal 16
    It was ^-4/3 not ^4/3, no?
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    (Original post by rich1334)
    Dammit, I put that but convinced myself out of it
    I thought that as the equation has no real roots, and the x^2 was positive, so k couldn't be a minus number, so put k>8/25...
    I don't know... Cant do anything about it now :P
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    (Original post by AlfieH)
    It was ^-4/3 not ^4/3, no?
    makes no difference, just means it's 1/16
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    (Original post by AlfieH)
    It was ^-4/3 not ^4/3, no?
    I meant that
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    (Original post by Parallex)
    Me and my friend were saying it's an odd function so both are acceptable?
    That's what I've been thinking if the question was asking for y = -1/(3x)
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    Can't remember the question order so sorry if it's wrong (it's definitely wrong). From what I can remember:
    1) 4 + 4root3
    2) can't really describe the graph, if you know what y=1/x looks like then reflect in either axis.
    Translation of 2 in x was -1/(x-2)
    The translation they wanted you to state was a stretch of 1/3 in either axis.
    3) 5^8
    5^(-1/4)
    5^(9/2)
    4) was this the one with k?
    Factorise the quadratic, draw graph. For y>0, x<-1 or x>3/2
    K < -25/8
    5) differentiation? Can't remember the answer to this, was reasonably straight forward though if you expanded brackets (or product rule from C3)
    6) simultaneous equation - x=2, y=1 or x=14/3, y=-13/3? Not sure about signs, think this is right though.
    7) differentiate x^(-1/3)? Should get out -1/48 when you put x in.
    8) coordinate geometry? Line was something like 6x-8y-29=0
    9) a=13
    Second derivative was positive therefore min points
    X=1/3
    10) centre (5,-2) radius 5
    Prove tangent
    Area of triangle = 40
    I've just realised how much I really cannot remember the order. These are my answers which seem to be generally accepted within my school and by various people on here. They may not be right.
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    everyone reply to this their predicted grade boundary for an A please
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    What do you guys think the raw mark for full UMS will be?
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    2014 was 65/72 this was *probably* a little harder than 2014 (2014 was a joke)

    guessing 61/62 for an A tbh
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    (Original post by Parallex)
    Me and my friend were saying it's an odd function so both are acceptable?
    Exactly. Its because there is only one power of x, and it is an odd power. Both directions are the same. A simplidied example is: get a y=x^3 graph. Now make it y=-x^3... Is it a reflection in the x axis or y axis? You can't know unless I specify whether the minus sign is being cubed as well. But it doesn't matter cos y=x^3 flipped in either axis gives the same image, as the minus sign would stay a minus sign even if it were cubed.
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    (Original post by Spriggs3)
    What do you guys think the raw mark for full UMS will be?
    72.
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    (Original post by Simonium1010)
    Exactly. Its because there is only one power of x, and it is an odd power. Both directions are the same. A simplidied example is: get a y=x^3 graph. Now make it y=-x^3... Is it a reflection in the x axis or y axis? You can't know unless I specify whether the minus sign is being cubed as well. But it doesn't matter cos y=x^3 flipped in either axis gives the same image, as the minus sign would stay a minus sign even if it were cubed.
    This is why the question was 'describe A transformation', not 'describe THE transformation'
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    For the equation of the line question, is -6x + 8y +29 = 0 also right instead of
    6x- 8y-29 =0
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    Would u get Ecf if you work out a y co ordinate wrong then a answer using the wron points. Please help!!!
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    (Original post by Sahil_)
    For the equation of the line question, is -6x + 8y +29 = 0 also right instead of
    6x- 8y-29 =0
    yes, probably
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    (Original post by Sahil_)
    For the equation of the line question, is -6x + 8y +29 = 0 also right instead of
    6x- 8y-29 =0
    Yes.
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    FP1 tomorrow
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    A 62
    b 56
    my guess, so 90 ums I guess is 67
    and 100 ums 72
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    (Original post by Parallex)
    FP1 tomorrow
    Was trying to forget about that one!
 
 
 
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