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Thread: The Maths Thread

  1. #46
    World Traveller Craig's Avatar
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    Quote Originally Posted by marc71178
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  2. #47
    World Traveller Craig's Avatar
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    Quote Originally Posted by aussie
    Here is one of the most complicated things i've ever done in maths its so confusing

    FH (X) = 2X - 3
    X +4

    Find A: H (-3)
    B: H(1/2)
    C: H(5)

    D: Calculate the value for X if (1): H(X) = 3
    (2): H(X) is undefined
    I'm stumped.

  3. #48
    All Time Legend Paid The Umpire's Avatar
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  4. #49
    Global Moderator Prince EWS's Avatar
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    It looks pretty simple to me actually.

    Just looks like substitution. The last one was a bit trickier (the unknown one) but it just involved fidding around with the equation to change the subject.
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  5. #50
    Cricketer Of The Year Burpey's Avatar
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    Quote Originally Posted by Paid The Umpire
    A ---> x = -1.8
    B ---> x = 5 and a third
    C ---> x = -5 and two thirds
    Da ---> x = -15
    Db ---> x = (3 + 4H(X)) over (2 - H(X))

    I thinks...
    Is this right? Cos I got totally different answers ... maybe I am on the wrong wavelength. It was hard to decipher what Aussie meant though. Too bad he's not here to clarify ...

  6. #51
    Global Moderator Prince EWS's Avatar
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    Quote Originally Posted by burkey_1988
    Is this right? Cos I got totally different answers ... maybe I am on the wrong wavelength. It was hard to decipher what Aussie meant though. Too bad he's not here to clarify ...
    Yeah... I got -9 for the first one...

  7. #52
    Cricketer Of The Year Burpey's Avatar
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    Quote Originally Posted by aussie
    Here is one of the most complicated things i've ever done in maths its so confusing

    FH (X) = 2X - 3
    X +4

    Find A: H (-3)
    B: H(1/2)
    C: H(5)

    D: Calculate the value for X if (1): H(X) = 3
    (2): H(X) is undefined
    My answers:

    A: -9
    B: -4/9
    C: 7/9
    D: (1) -15
    (2) -4

    Maths experts, am I correct?

  8. #53
    International Captain Buddhmaster's Avatar
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    Woah, I have no idea what's going on.

  9. #54
    International Regular twctopcat's Avatar
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    My answers:

    A) -9
    B) -4/9
    C) 7/9
    D) 1. -15

    3. X = (3+4y)/(2-y)
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  10. #55
    Cricketer Of The Year Burpey's Avatar
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    Isn't D (2) X=-4 ... to be undefined to denominator has to be zero. Therefore, when X = -4 the denominator is zero

  11. #56
    Cricket Web Staff Member / Global Moderator Neil Pickup's Avatar
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    Quote Originally Posted by twctopcat
    I did Econometric Methods in the second year, taught by Cherif Guermat, what a man!! Never really worked out the difference between the 2 but i know they should be worth double most other modules. Brilliant stuff with the 77 though, your a better man than me! You on for a first then??
    Yep - 75 in Macro and 100 in Micro (and 61 in French) - average of 78.25 and well on for a good first
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  12. #57
    Spanish_Vicente sledger's Avatar
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    how long is aussie banned for ?

  13. #58
    International Regular twctopcat's Avatar
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    Quote Originally Posted by Neil Pickup
    Yep - 75 in Macro and 100 in Micro (and 61 in French) - average of 78.25 and well on for a good first
    100 in micro, my mate got in the 90's and i thought he was good! Fair play!

  14. #59
    Eyes not spreadsheets marc71178's Avatar
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    Quote Originally Posted by Craig
    And if I were the tax geek I would say do it yourself.
    No, the tax geeks actually enjoy it!
    marc71178 - President and founding member of AAAS - we don't only appreciate when he does well, but also when he's not quite so good!

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  15. #60
    Cricket Web Staff Member / Global Moderator Neil Pickup's Avatar
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    I can confirm that Burkey is right on all counts.

    Basically what it means is:
    To calculate H given a set value of X, just do: (2x-3)/(x+4)

    If X=-3, then H=(-9)/(1) = -9
    If X=0.5, then H=(-2)/(-4.5) = -0.44 or -4/9
    If X=5, then H=(7)/(9) = 0.78 or 7/9

    For the next part, you need (2x-3)/(x+4) to equal three.
    Multiplying both sides by (x+4) gives you (2x-3) = 3(x+4)
    Expansion gives 2x-3 = 3x+12
    Collecting like terms gives you x=-15

    The last part is the easiest. For a fraction to be undefined, the bottom (denominator) has to be zero. So... (x+4) = 0 - and x = -4

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