Results 1 to 2 of 2

Math Help - Quadradic

  1. #1
    Junior Member
    Joined
    Jul 2007
    Posts
    30

    Quadradic

    x^2-7x=3

    and

    x+8=1-x^2

    Dont even know where to begin

    Please help..
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by getnaphd View Post
    x^2-7x=3

    and

    x+8=1-x^2

    Dont even know where to begin

    Please help..
    These are quadratics, rearrange then into standard form then apply the
    quadratic formula.

    The first can be rearranges to x^2-7x-3=0. Now the quadratic
    formula tells us that if we have a quadratic ax^2+bx+c=0, then:

    <br />
x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}<br />

    In the current case a=1,\ b=-7,\ c=-3, so:

    <br />
x=\frac{7 \pm \sqrt{49+12}}{2}<br />

    RonL
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. quadradic
    Posted in the Algebra Forum
    Replies: 1
    Last Post: September 20th 2008, 10:10 AM
  2. fit to quadradic
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: May 10th 2008, 09:10 PM
  3. quadradic
    Posted in the Algebra Forum
    Replies: 4
    Last Post: March 31st 2008, 12:06 AM
  4. quadradic
    Posted in the Algebra Forum
    Replies: 1
    Last Post: March 29th 2008, 09:04 PM
  5. quadradic
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 15th 2008, 01:45 PM

Search Tags


/mathhelpforum @mathhelpforum