Results 1 to 8 of 8

Math Help - polynomial problem

  1. #1
    Newbie
    Joined
    Jul 2007
    From
    Springfield, IL
    Posts
    11

    polynomial problem

    (3x-2x-7)(8x-8x+7)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    What are we to do with this?. Solve?. Expand?.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jul 2007
    From
    Springfield, IL
    Posts
    11
    The worksheet says simplify. I have worked it three times, and keep coming up with the same answer, but it is not the correct answer.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor red_dog's Avatar
    Joined
    Jun 2007
    From
    Medgidia, Romania
    Posts
    1,245
    Thanks
    1
    (3x^3-2x^2-7)(8x^2-8x+7)=24x^5-40x^4+37x^3-70x^2+56x-49
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    I don't know what they mean by simplify. What you posted is the factorization of the quintic red dog showed you. It's already 'simplified'.

    Are you sure it isn't division?.

    \frac{3x^{3}-2x^{2}-7}{8x^{2}-8x+7}
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Jul 2007
    From
    Springfield, IL
    Posts
    11
    I copied exactly from the college prep packet I got. I think you're right, though. I think it's supposed to be addition or subtraction. Thank you for helping...I appreciate it.
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Newbie
    Joined
    Jul 2007
    From
    Springfield, IL
    Posts
    11
    I just worked it as addition and subtraction, and it is neither. The answer in the back is
    3x-10x+8x+11
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    If they were subtracted it would be:

    3x^{3}-10x^{2}+8x-14

    Added it would be 3x^{3}+6x^{2}-8x

    I don't know what they're doing.

    But, (3x^{3}-2x^{2}+7)-(8x^{2}-8x-4)=3x^{3}-10x^{2}+8x+11
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Polynomial problem
    Posted in the Pre-Calculus Forum
    Replies: 5
    Last Post: January 15th 2011, 02:44 AM
  2. [SOLVED] Polynomial problem
    Posted in the Algebra Forum
    Replies: 3
    Last Post: October 8th 2010, 04:40 AM
  3. problem with polynomial
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 23rd 2010, 05:59 PM
  4. A Problem of Polynomial
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: December 9th 2008, 04:09 AM
  5. Zero Polynomial problem
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: November 11th 2008, 02:28 PM

Search Tags


/mathhelpforum @mathhelpforum