Results 1 to 5 of 5

Math Help - Quadratic Formula - Help needed

  1. #1
    Junior Member
    Joined
    Jul 2009
    Posts
    36

    Smile Quadratic Formula - Help needed

    HI

    How is this solved with quadratic formula:

    3n^2-21n+38=20

    ps. I put 3 instead of a, 21 instead of b, and 38 instead of c, but I can't get the result I want.
    I know n=6, but how do i get this..?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,139
    Thanks
    1013
    Quote Originally Posted by alternative View Post
    HI

    How is this solved with quadratic formula:

    3n^2-21n+38=20

    ps. I put 3 instead of a, 21 instead of b, and 38 instead of c, but I can't get the result I want.
    I know n=6, but how do i get this..?
    b = -21

    c = 18
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Jul 2009
    Posts
    36

    Smile

    could I ask why c=18, thanks a lot
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,139
    Thanks
    1013
    Quote Originally Posted by alternative View Post
    could I ask why c=18, thanks a lot
    because the quadratic equation works if ax^2 + bx + c = 0
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    Jul 2009
    Posts
    36
    ouppppssss :$


    Thank you, so so so much..
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Simple Formula Help Needed
    Posted in the Algebra Forum
    Replies: 2
    Last Post: June 26th 2010, 12:22 PM
  2. Formula needed, all data available
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: November 26th 2009, 09:10 AM
  3. Simple formula needed?
    Posted in the Geometry Forum
    Replies: 4
    Last Post: August 3rd 2009, 01:09 PM
  4. Formula needed for computation
    Posted in the Algebra Forum
    Replies: 1
    Last Post: April 14th 2009, 09:30 AM
  5. Formula Needed
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 11th 2007, 12:32 PM

Search Tags


/mathhelpforum @mathhelpforum