Results 1 to 5 of 5

Math Help - find hypotenuse

  1. #1
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897

    find hypotenuse

    hi,

    i need to solve x^2-18x+53=0 to find length of hypotenuse. i am unsure how to do this so some help would be greatly appreciated!

    would i do quadratic equation on it??

    thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    earboth's Avatar
    Joined
    Jan 2006
    From
    Germany
    Posts
    5,807
    Thanks
    116
    Quote Originally Posted by andyboy179 View Post
    hi,

    i need to solve x^2-18x+53=0 to find length of hypotenuse. i am unsure how to do this so some help would be greatly appreciated!

    would i do quadratic equation on it??

    thanks
    This

    x^2-18x+53=0

    is a quadratic equation. To solve it for x use the quadratic formula:

    The quadratic equation ax^2 + bx +c = 0 has the solution:

    x = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

    Plug in the values of a, b and c which you already know.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897
    i can do that but i will give me two different answers for x however i only need one what do i do with both the answers?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member TheChaz's Avatar
    Joined
    Nov 2010
    From
    Northwest Arkansas
    Posts
    600
    Thanks
    2
    Choose the positive answer, since the side length of a triangle can't be negative (up to obscure fields of study )
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Super Member
    earboth's Avatar
    Joined
    Jan 2006
    From
    Germany
    Posts
    5,807
    Thanks
    116
    Quote Originally Posted by andyboy179 View Post
    i can do that but i will give me two different answers for x however i only need one what do i do with both the answers?
    I don't know! Since both solutions are positive you have to refer to the text of the question. If there aren't any specifications you can use both values.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. two ways to find hypotenuse
    Posted in the Geometry Forum
    Replies: 2
    Last Post: July 31st 2010, 10:50 PM
  2. Replies: 3
    Last Post: May 23rd 2010, 01:26 AM
  3. How to find the length of the hypotenuse
    Posted in the Geometry Forum
    Replies: 5
    Last Post: November 21st 2009, 09:25 AM
  4. find length of hypotenuse
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: June 8th 2009, 12:43 AM
  5. Replies: 3
    Last Post: June 20th 2007, 02:56 PM

Search Tags


/mathhelpforum @mathhelpforum