Results 1 to 3 of 3

Math Help - Quadratic and other polynomials

  1. #1
    Junior Member
    Joined
    Feb 2009
    Posts
    63

    Exclamation Quadratic and other polynomials

    Use the quadratic to solve for x:
    x-1 = 2x+1
    2-x

    Please show all working out, thanks.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member Stroodle's Avatar
    Joined
    Jun 2009
    Posts
    367
    Which part are you having trouble with?

    First you need to rearrange the equation into the form ax^2+bx+c=0

    so you have:

    \frac{x-1}{2-x}=2x+1

    x-1=\left ( 2x+1\right )\left ( 2-x\right )

    x-1=4x-2x^2+2-x

    2x^2-2x-3=0

    So now you can see that a=2, b=-2 and c=-3

    Once you plug these values into to quadratic formula and simplify it, you will have the solutions. Are you ok with this part?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Feb 2009
    Posts
    63
    Thank You so much, i understand it from here.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Quadratic and other polynomials
    Posted in the Algebra Forum
    Replies: 3
    Last Post: March 6th 2010, 01:57 PM
  2. Completing the Square (Quadratic Polynomials)
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: June 3rd 2009, 04:58 AM
  3. Factorising quadratic polynomials
    Posted in the Algebra Forum
    Replies: 5
    Last Post: April 22nd 2009, 05:09 PM
  4. Quadratic Polynomials
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 20th 2008, 12:48 AM
  5. linear and quadratic polynomials
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 1st 2007, 07:21 AM

Search Tags


/mathhelpforum @mathhelpforum