Results 1 to 3 of 3

Math Help - remainder theorm

  1. #1
    Newbie
    Joined
    Jan 2009
    Posts
    1

    remainder theorm

    can help me with this one??

    1. Use the remainder theorm to find the remainder when 2x^2-3x^2+7x-4
    is divided by (x+1)

    thanks guys..
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Dec 2008
    From
    Scotland
    Posts
    901
    Quote Originally Posted by stubrady12345 View Post
    can help me with this one??

    1. Use the remainder theorm to find the remainder when 2x^2-3x^2+7x-4
    is divided by (x+1)

    thanks guys..
    Did you REALLY mean 2x^2-3x^2+7x-4 or what it supposed to be:

    2x^3-3x^2+7x-4

    I'm assuming the last.

    Let  P(x) = 2x^3-3x^2+7x-4

    We can express this in the form:

     P(x) = q(x)(x+1) + r(x)

    r(x) is the remainder!

    Consider  P(-1)

     P(-1) = q(-1)(-1+1) + r(-1)

     P(-1) = q(-1)(0) + r(-1)


     P(-1) =  r(-1)

    And we can find P(-1) from the original equation!:


     P(-1) = 2(-1)^3-3(-1)^2+7(-1)-4
    Follow Math Help Forum on Facebook and Google+

  3. #3
    A riddle wrapped in an enigma
    masters's Avatar
    Joined
    Jan 2008
    From
    Big Stone Gap, Virginia
    Posts
    2,551
    Thanks
    12
    Awards
    1
    Quote Originally Posted by stubrady12345 View Post
    can help me with this one??

    1. Use the remainder theorm to find the remainder when 2x^2-3x^2+7x-4
    is divided by (x+1)

    thanks guys..
    Hello stubrady,

    I think you got an exponent wrong there somewhere but remember when f(x) is divided by (x - a), the remainder is the constant f(a).

    So, find f(-1).
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Rolle's Theorm example
    Posted in the Advanced Applied Math Forum
    Replies: 2
    Last Post: September 22nd 2011, 09:45 PM
  2. Can someone help me with the Chebyshev's Theorm?
    Posted in the Statistics Forum
    Replies: 1
    Last Post: February 15th 2010, 09:42 AM
  3. Residue Theorm - Q1
    Posted in the Differential Geometry Forum
    Replies: 6
    Last Post: October 3rd 2009, 08:35 AM
  4. Remainder Theorm
    Posted in the Algebra Forum
    Replies: 1
    Last Post: May 17th 2008, 11:49 AM
  5. Remainder Theorm
    Posted in the Algebra Forum
    Replies: 7
    Last Post: December 16th 2007, 09:33 AM

Search Tags


/mathhelpforum @mathhelpforum