Results 1 to 2 of 2

Math Help - An odd imaginary number problem (a+bi form)

  1. #1
    Newbie
    Joined
    Jan 2010
    Posts
    4

    An odd imaginary number problem (a+bi form)

    This problem:


    Find all solutions of the equation and express them in the form a + bi.


    x^2 +2/5x +5 =0



    It is confusing me, since the answer shows as something that I don't know how to get to using the methods I know.


    The answer is -1/5 + or - 2/1 X 31^1/2i



    The 31 is raised to the 1/2 Power. I don't understand that. I must have forgot something from algebra dealing with that. Could someone tell me how that answer is gotten?

    Thanks.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Aug 2007
    From
    USA
    Posts
    3,111
    Thanks
    2
    What do you get when you use the Quadratic Formula?

    An exponent of "1/2" is a square root. Generally, \sqrt{x} = x^{\frac{1}{2}}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Imaginary numbers and their polar form
    Posted in the Differential Geometry Forum
    Replies: 5
    Last Post: June 9th 2011, 09:30 AM
  2. Replies: 2
    Last Post: June 6th 2011, 07:39 PM
  3. Imaginary number proof problem
    Posted in the Algebra Forum
    Replies: 2
    Last Post: June 2nd 2011, 12:31 AM
  4. Replies: 4
    Last Post: January 18th 2011, 04:34 PM
  5. imaginary number problem
    Posted in the Algebra Forum
    Replies: 6
    Last Post: September 16th 2007, 11:45 AM

Search Tags


/mathhelpforum @mathhelpforum