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

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    (Original post by Kadak)
    Im still abit muddled on stationary points,increasing and decreasing fucntions and when to use the second deritive ?
    Stationary points -> dy/dx = 0.
    For increasing functions, the gradient will be positive and for decreasing functions, the gradient will be negative.
    The second derivative (d2y/dx2) is used to find the nature of a stationary point, i.e. whether it is a maximum or a minimum, or point of inflection but these are less common. Differentiate once to get dy/dx then differentiating this again will give you the second derivative.
    Substitute in the value for x where the turning point is, and if d2y/dx2 is positive -> minimum point and if negative -> maximum point.
    If the result of the second derivative is 0, you need to test two points either side of the stationary point (as close to it as possible) and determine whether the gradients there are +ve or -ve. If the gradient goes +ve -> SP -> -ve, the point is a max.
    If it goes -ve -> SP -> +ve, the point is a min. If the two points both have +ve gradients or both have -ve gradients, it's a point of inflection.
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    (Original post by chloe-jessica)
    Stationary points -> dy/dx = 0.
    For increasing functions, the gradient will be positive and for decreasing functions, the gradient will be negative.
    The second derivative (d2y/dx2) is used to find the nature of a stationary point, i.e. whether it is a maximum or a minimum, or point of inflection but these are less common. Differentiate once to get dy/dx then differentiating this again will give you the second derivative.
    Substitute in the value for x where the turning point is, and if d2y/dx2 is positive -> minimum point and if negative -> maximum point.
    If the result of the second derivative is 0, you need to test two points either side of the stationary point (as close to it as possible) and determine whether the gradients there are +ve or -ve. If the gradient goes +ve -> SP -> -ve, the point is a max.
    If it goes -ve -> SP -> +ve, the point is a min. If the two points both have +ve gradients or both have -ve gradients, it's a point of inflection.


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    Ty so much! I'm going to bed now 😃.Good night and goodluck tomorrow.
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    (Original post by Kadak)
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    Ty so much! I'm going to bed now 😃.Good night and goodluck tomorrow.
    I should probably head to bed too 🙈 best of luck with the exam
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    What did everyone think of the exam?
    It went well for me, I just hope the grade boundaries aren't too high.

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    (Original post by jampot98)
    What did everyone think of the exam?
    It went well for me, I just hope the grade boundaries aren't too high.

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    I think it went quite well - hopefully anyway
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    Easy exam so I think I made a load of mistakes. I suspect grade boundaries will be high
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    It went pretty well, even though I know I screwed up one of the indices questions. Lots of disagreement at college about the last question though
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    General consensus at my school is that the answer was 40

    Yeah, I found the paper easier than last year's...fearing high grade boundaries.
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    Last question? 40 or 50
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    what did everyone get for the last question..area of triangle one ???
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    (Original post by ella_chloe)
    Last question? 40 or 50
    Pretty much everyone at my college got 40 but used loads of different methods to get that
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    (Original post by freyfreyy96)
    Pretty much everyone at my college got 40 but used loads of different methods to get that

    (Original post by lily9666768)
    what did everyone get for the last question..area of triangle one ???

    (Original post by ella_chloe)
    Last question? 40 or 50
    I got 40 too, using 1/2b x h
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    (Original post by lily9666768)
    what did everyone get for the last question..area of triangle one ???
    I got 40

    But I thought that was a really good paper
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    (Original post by AstroNandos)
    I got 40

    But I thought that was a really good paper
    Did you get k > 25/8 ?
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    What did you guys get for the other stationary point
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    What did everyone get for question 6, the simultaneous equation one??
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    (Original post by Dentist214)
    What did you guys get for the other stationary point
    X=1/3

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    (Original post by Dentist214)
    What did you guys get for the other stationary point
    Like a third
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    (Original post by Dentist214)
    What did you guys get for the other stationary point
    2 & 14/3 I think.
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    What did people get for the equation of the line through the mid point of AB?
 
 
 
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