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Equation

  • 18-03-2009 9:37am
    #1
    Closed Accounts Posts: 62 ✭✭


    (1/3*X^3)+(2X^2)-(5X)+7

    Can anyone find the Max and Min of this equation mathimatically
    Show all workings

    Prize for the first person who gets it right
    Tagged:


Comments

  • Registered Users, Registered Users 2 Posts: 5,999 ✭✭✭GhostInTheRuins


    I'm not doing your homework boyo


  • Closed Accounts Posts: 8,015 ✭✭✭CreepingDeath


    (1/3*X^3)+(2X^2)-(5X)+7

    Can anyone find the Max and Min of this equation mathimatically
    Show all workings

    Prize for the first person who gets it right

    The min is 1 and the max is 7.


  • Closed Accounts Posts: 62 ✭✭Granny Lover


    The min is 1 and the max is 7.
    Both are Min and you didnt show workings


  • Closed Accounts Posts: 1,476 ✭✭✭Mr.Lizard


    (1/3*X^3)+(2X^2)-(5X)+7

    Can anyone find the Max and Min of this equation mathimatically
    Show all workings

    Prize for the first person who gets it right

    Surely you win the prize, that of someone doing your homework for you?


  • Closed Accounts Posts: 62 ✭✭Granny Lover


    Not Homework im just bored and enjoy Maths


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  • Registered Users, Registered Users 2 Posts: 25,243 ✭✭✭✭Jesus Wept


    2+2 is 4


  • Closed Accounts Posts: 44 Bernard Black


    I'm not doing your homework boyo
    Mr.Lizard wrote: »
    Surely you win the prize, that of someone doing your homework for you?

    Sounds like someone doesnt know how to work out the max and the min of a simple equation!


  • Registered Users, Registered Users 2 Posts: 1,218 ✭✭✭Zangetsu


    Sounds like someone doesnt know how to work out the max and the min of a simple equation!



    Ho ho ho ho ho BURNED!


    Seriously though, maths in AH? That's a new one!


  • Posts: 17,378 ✭✭✭✭ [Deleted User]


    maths forum ftw


  • Registered Users, Registered Users 2 Posts: 33,776 ✭✭✭✭Princess Consuela Bananahammock


    Sounds like someone doesnt know how to work out the max and the min of a simple equation!

    No idea.
    42?

    Everything I don't like is either woke or fascist - possibly both - pick one.



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  • Registered Users, Registered Users 2 Posts: 2,813 ✭✭✭Gone Drinking


    Thought this was going to be a thread about the equator, which was going to lead me to commenting on the titties of local tribeswomen who live in or around the equator.

    Utterly disappointed


  • Closed Accounts Posts: 13,130 ✭✭✭✭Kiera


    Not Homework im just bored and enjoy Maths
    Maths and grannies? You could just go count the wrinkles on your garnnies...... :P


  • Registered Users, Registered Users 2 Posts: 5,999 ✭✭✭GhostInTheRuins


    Sounds like someone doesnt know how to work out the max and the min of a simple equation!

    I can't believe it, I've been rumbled :rolleyes:


  • Registered Users, Registered Users 2 Posts: 6,854 ✭✭✭zuutroy


    A timely reminder of the amount of pointless crap you learn in school.


  • Closed Accounts Posts: 27,252 ✭✭✭✭stovelid


    7X6


  • Closed Accounts Posts: 5,813 ✭✭✭themadchef


    Maths :eek: recurring Leaving cert nightmare alert.

    Hips to waist ratio, wish i paid more attention to that one.


  • Registered Users, Registered Users 2 Posts: 2,648 ✭✭✭token56


    (1/3*X^3)+(2X^2)-(5X)+7

    Can anyone find the Max and Min of this equation mathimatically
    Show all workings

    Prize for the first person who gets it right


    dy/dx = x^2 + 4x - 5 = 0

    (x + 5)(x - 1)

    x = -5, 1

    d^2y/dx^2 = 2x + 4

    for x = -5, d^2y/dx^2 = -2, > 0 therefore maximum

    for x = 1, d^2y/dx^2 = 6, > 0, therefore minimum

    max at -5, min at 1

    at least thats what i think it is if i remeber my leaving cert maths


    edit: mistake


  • Closed Accounts Posts: 16,705 ✭✭✭✭Tigger


    token56 wrote: »
    dy/dx = x^2 + 4x - 5 = 0

    (x + 5)(x - 1)

    x = -5, 1

    d^2y/dx^2 = 2x + 4

    for x = -5, d^2y/dx^2 = -2, > 0 therefore maximum

    for x = 1, d^2y/dx^2 = 6, > 0, therefore minimum

    max at -5, min at 1

    at least thats what i think it is if i remeber my leaving cert maths


    edit: mistake

    god i hated the leaving cert


  • Registered Users, Registered Users 2 Posts: 15,094 ✭✭✭✭javaboy


    Maths+AH=Fail


This discussion has been closed.
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