Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Help with this question

  • 21-12-2010 12:08am
    #1
    demolitionman
    Closed Accounts Posts: 168 ✭✭


    sorry, i know its probably basic enough.
    any help with it.
    thanks.


Comments

  • #2
    MathsManiac
    Registered Users, Registered Users 2 Posts: 1,595 ✭✭✭MathsManiac


    In the quadratic equation ax^2 + bx + c = 0, the roots are equal if b^2 - 4ac = 0. (If you examine the "-b" formula, you should be able to see why.)

    This should allow you to solve this problem.


  • #3
    demolitionman
    Closed Accounts Posts: 168 ✭✭demolitionman


    MathsManiac wrote: »
    In the quadratic equation ax^2 + bx + c = 0, the roots are equal if b^2 - 4ac = 0. (If you examine the "-b" formula, you should be able to see why.)

    This should allow you to solve this problem.

    thanks mate!
    trying to help the younger sister with her maths homework and its been five years since i done the LC so im a bit rusty!!!:rolleyes:


  • #4
    Mellor
    Registered Users, Registered Users 2 Posts: 39,902 ✭✭✭✭Mellor


    MathsManiac wrote: »
    (If you examine the "-b" formula, you should be able to see why.)

    And once you figure out that part, you should be able to cancel it down to a handy way to work out the roots when they are equal


Advertisement