Results 1 to 2 of 2

Math Help - quadratic formula

  1. #1
    Member
    Joined
    Oct 2008
    Posts
    124

    quadratic formula

    b^2 - 2ab - a^2 = 0
    Can I use the quadratic formula to solve for b? If so, how? I have tried repeated times and I keep getting the wrong answer...
    Follow Math Help Forum on Facebook and Google+

  2. #2
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    Quote Originally Posted by bearej50 View Post
    b^2 - 2ab - a^2 = 0
    Can I use the quadratic formula to solve for b? If so, how? I have tried repeated times and I keep getting the wrong answer...
    You can assuming a is constant

    b = \frac{2a \pm \sqrt{4a^2-(4 \cdot 1 \cdot -(a^2))}}{2}

    b = \frac{2a \pm 2a \sqrt{2}}{2} = a(1 \pm \sqrt{2})
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. The Quadratic Formula
    Posted in the Algebra Forum
    Replies: 7
    Last Post: July 12th 2009, 11:06 AM
  2. quadratic formula
    Posted in the Algebra Forum
    Replies: 9
    Last Post: August 21st 2008, 10:52 AM
  3. Using the Quadratic Formula???
    Posted in the Algebra Forum
    Replies: 5
    Last Post: March 10th 2008, 04:41 AM
  4. Quadratic Formula
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: June 8th 2007, 12:13 PM
  5. Quadratic Formula
    Posted in the Algebra Forum
    Replies: 14
    Last Post: April 15th 2007, 07:11 AM

Search Tags


/mathhelpforum @mathhelpforum