Page 2 of 2 FirstFirst 12
Results 16 to 20 of 20
Like Tree9Thanks

Math Help - Solving Quadratic Equations & Determining Quadratic Rules

  1. #16
    MHF Contributor MarkFL's Avatar
    Joined
    Dec 2011
    From
    St. Augustine, FL.
    Posts
    1,988
    Thanks
    734

    Re: Solving Quadratic Equations & Determining Quadratic Rules

    No not at all, I just wanted to point out that using the calculus may not be much help to a student posting in the Algebra forum. But there's no need to remove your post on my account.
    Follow Math Help Forum on Facebook and Google+

  2. #17
    Member
    Joined
    Jan 2013
    From
    Australia
    Posts
    159
    Thanks
    3

    Re: Solving Quadratic Equations & Determining Quadratic Rules

    I worked it out to be c = -13.

    On to part 2!

    Would I work it out the same as part 1? (i.e. solve for m when the discriminant = 0)

    So far I've done:

    mx + 6 = -2x2 - 6x +2

    -2x2 - 6x - 4 - mx = 0

    (I have a feeling this isn't correct.)
    Follow Math Help Forum on Facebook and Google+

  3. #18
    MHF Contributor MarkFL's Avatar
    Joined
    Dec 2011
    From
    St. Augustine, FL.
    Posts
    1,988
    Thanks
    734

    Re: Solving Quadratic Equations & Determining Quadratic Rules

    Yes, you want to equate the discriminant to zero, but I would write the quadratic as:

    2x^2+(m+6)x+4=0

    Now, what is the discriminant here?
    Thanks from Fratricide
    Follow Math Help Forum on Facebook and Google+

  4. #19
    Member
    Joined
    Jan 2013
    From
    Australia
    Posts
    159
    Thanks
    3

    Re: Solving Quadratic Equations & Determining Quadratic Rules

    The discriminant there would be (m + 6)2 - 32 which, solved for x, gives us -6 4√2 -- the correct answer.

    Thanks for the help, Mark.

    One final question: How do you properly type equations? I tried pasting them from Microsoft Equation 3.0 (via Word) but to no avail.
    Thanks from MarkFL
    Follow Math Help Forum on Facebook and Google+

  5. #20
    MHF Contributor MarkFL's Avatar
    Joined
    Dec 2011
    From
    St. Augustine, FL.
    Posts
    1,988
    Thanks
    734

    Re: Solving Quadratic Equations & Determining Quadratic Rules

    Quote Originally Posted by Fratricide View Post
    The discriminant there would be (m + 6)2 - 32 which, solved for x, gives us -6 4√2 -- the correct answer.

    Thanks for the help, Mark.

    One final question: How do you properly type equations? I tried pasting them from Microsoft Equation 3.0 (via Word) but to no avail.
    Good work!

    To express mathematical expression, many forums, including MHF, use \LaTeX. A search here and online will yield information and tutorials on its usage.
    Thanks from Fratricide
    Follow Math Help Forum on Facebook and Google+

Page 2 of 2 FirstFirst 12

Similar Math Help Forum Discussions

  1. Solving quadratic equations
    Posted in the Pre-Calculus Forum
    Replies: 5
    Last Post: August 14th 2011, 06:04 AM
  2. Solving quadratic equations
    Posted in the Algebra Forum
    Replies: 2
    Last Post: July 17th 2011, 08:15 PM
  3. Determining Quadratic Rules
    Posted in the Algebra Forum
    Replies: 2
    Last Post: March 23rd 2009, 06:12 AM
  4. Replies: 1
    Last Post: June 12th 2008, 09:30 PM
  5. Solving quadratic equations
    Posted in the Algebra Forum
    Replies: 2
    Last Post: April 15th 2007, 07:02 PM

Search Tags


/mathhelpforum @mathhelpforum