Results 1 to 2 of 2

Math Help - Graphs

  1. #1
    Member
    Joined
    Dec 2007
    Posts
    80

    Graphs

    I have the graph showing y=1
    _____ , x equals with a cross through 0.
    X

    How can i use the graph to find approximate roots for the equation 1
    ___ =2x+3
    X

    Also how can i rearrange 1
    ___ =2x+3 to form a quadratic equation?
    x
    leaving it in the form of P+or - R(in square root)
    ____________________
    r

    I am really stuck with this and getting really muddled lol Thank you for your time
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    earboth's Avatar
    Joined
    Jan 2006
    From
    Germany
    Posts
    5,829
    Thanks
    123
    Quote Originally Posted by Chez_ View Post
    I have the graph showing y=1
    _____ , x equals with a cross through 0.
    X

    How can i use the graph to find approximate roots for the equation 1
    ___ =2x+3
    X

    Also how can i rearrange 1
    ___ =2x+3 to form a quadratic equation?
    x
    leaving it in the form of P+or - R(in square root)
    ____________________
    r

    I am really stuck with this and getting really muddled lol Thank you for your time
    Hi,

    draw into the same coordinate system the line y = 2x+3 . The x-value(s) of the point of intersection are the solution(s) of the equation.

    You have:

    \frac1x = 2x+3 . Multiply both sides by x which yields:

    1 = 2x^2 + 3x~\iff~2x^2+3x-1=0 From your answer I assume that you are allowed to use the formula to calculate the solutions:

    x = -\frac{3}{2 \cdot 2} \pm \sqrt{\dfrac{3^2 - 4 \cdot 2 \cdot (-1)}{4 \cdot 2^2 }} . Simplify to get: x = -\frac{3}{4} \pm \sqrt{\dfrac{17}{16 }}= -\frac{3}{4} \pm \frac14 \cdot \sqrt{17}
    Attached Thumbnails Attached Thumbnails Graphs-graph_solve.jpg  
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Graphs
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: March 3rd 2010, 06:54 AM
  2. Graphs
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: March 2nd 2010, 08:25 PM
  3. Replies: 0
    Last Post: December 29th 2009, 08:08 PM
  4. graphs
    Posted in the Discrete Math Forum
    Replies: 0
    Last Post: April 30th 2008, 09:08 PM
  5. Help with graphs
    Posted in the Pre-Calculus Forum
    Replies: 6
    Last Post: October 20th 2007, 10:03 PM

Search Tags


/mathhelpforum @mathhelpforum