Results 1 to 5 of 5

Math Help - basic help?

  1. #1
    Newbie
    Joined
    May 2012
    From
    here
    Posts
    3

    basic help?

    it's been a while since I've done math, and i know most of this stuff but have some particular rust issues
    such as:


    in problems such as this one:


    (x^2-3x-4) - (x^3+x^2+x+5)


    what do I do? Obviously is not multiplying because of that - sign. do I have to solve the first one, which can be done easily, and then just substact the whole thing??


    also in another problem I ended up with this:


    9x^2-24x+16
    I know I can contnue factoring but how exactly do I do it?
    (3x- ) (3x+ )


    Im not sure what to do when the x^2 has a number in front. do those 3 have to multiply the numbers I use in the blank space??




    and this problem tells me to find the quotient and remainder
    problem is: 4x^3-3x^3+x+1 divided by x+2


    so my question is, how do I even start with this? do I literally divide it or does the x+2 flip to the top and I just multiply the rest??
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28

    Re: basic help?

    Quote Originally Posted by purplelove707 View Post


    (x^2-3x-4) - (x^3+x^2+x+5)


    what do I do? Obviously is not multiplying because of that - sign. do I have to solve the first one, which can be done easily, and then just substact the whole thing??

    (x^2-3x-4) - (x^3+x^2+x+5)

    Distribute the minus sign through the second set of brackets

    x^2-3x-4 - x^3-x^2-x-5

    Now group the like terms.


    Quote Originally Posted by purplelove707 View Post

    also in another problem I ended up with this:


    9x^2-24x+16
    I know I can contnue factoring but how exactly do I do it?
    (3x- ) (3x+ )
    (3x- a) (3x+ b)

    find a and b such that ab=16 and 3xb-3xa = -24x

    Quote Originally Posted by purplelove707 View Post


    and this problem tells me to find the quotient and remainder
    problem is: 4x^3-3x^3+x+1 divided by x+2


    Read this guy... Polynomial Long Division
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    May 2012
    From
    here
    Posts
    3

    Re: basic help?

    Quote Originally Posted by pickslides View Post
    (x^2-3x-4) - (x^3+x^2+x+5)

    Distribute the minus sign through the second set of brackets

    x^2-3x-4 - x^3-x^2-x-5

    Now group the like terms.
    thanks

    I thought it was something like that, but it seemed too simple. Now I'm just having some issues with some weird answers I'm getting in similar problems, but I can take it from here

    gonna read on the polynomial long division. thanks again!
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    May 2012
    From
    here
    Posts
    3

    Re: basic help?

    if you can help me with just another thing

    there are several problems where I end up with things like this:

    x^3+3x^2+3x+1

    now I see I can continue factoring by x, but that 1 at the end confuses me. can I just leave it outside of the factoring or does the 1 simply dissapear? or is this the end of the operation?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Member
    Joined
    Sep 2010
    Posts
    151
    Thanks
    3

    Re: basic help?

    Quote Originally Posted by purplelove707 View Post
    if you can help me with just another thing

    there are several problems where I end up with things like this:

    x^3+3x^2+3x+1

    now I see I can continue factoring by x, but that 1 at the end confuses me. can I just leave it outside of the factoring or does the 1 simply dissapear? or is this the end of the operation?
    x^3+3x^2+3x+1 can be factorised further

    Try dividing x+1 into x^3 + 3x^2 + 3x +1 using the polynomial division you read up on earlier.


    Not sure if you have ever seen Pascal's triangle or done binomial coefficients but they can help you factorise equations of this form. Pascal's triangle
    Last edited by linalg123; May 29th 2012 at 09:44 AM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. really basic %'s
    Posted in the Algebra Forum
    Replies: 1
    Last Post: July 5th 2010, 09:40 AM
  2. Basic Matlab help. Can't seem to grasp basic concept
    Posted in the Math Software Forum
    Replies: 5
    Last Post: February 28th 2010, 08:12 PM
  3. Orthogonal basic && basic for the orthogonal complement
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: December 5th 2009, 06:33 AM
  4. Replies: 6
    Last Post: November 6th 2009, 09:28 PM
  5. basic
    Posted in the Algebra Forum
    Replies: 3
    Last Post: June 26th 2009, 11:56 AM

Search Tags


/mathhelpforum @mathhelpforum