Results 1 to 5 of 5

Math Help - One of the factors is

  1. #1
    Newbie
    Joined
    Feb 2011
    Posts
    17

    Post One of the factors is

    15x^2 + 17x - 4
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,590
    Thanks
    1445
    One of the factors of WHAT is \displaystyle 15x^2 + 17x - 4?

    Or are you asking how do you factorise \displaystyle 15x^2 + 17x - 4?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Feb 2011
    Posts
    17
    the question give me 5 answers :
    a) 15x-1
    b) 3x-4
    c) 5x+1
    d) 3x-1
    e) 3x+4
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,590
    Thanks
    1445
    But WHAT is the question? Is it asking you "which of these 5 choices is a factor of this expression?"
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor

    Joined
    Apr 2005
    Posts
    15,790
    Thanks
    1531
    Quote Originally Posted by hoanghai549 View Post
    the question give me 5 answers :
    a) 15x-1
    b) 3x-4
    c) 5x+1
    d) 3x-1
    e) 3x+4
    Assuming the problem really is "which of these 5 choices is a factor of this expression?", start with each of them and think what must be the other factor. For example, if one factor were 15x- 1, the other would be of the form ax+ b. (15x- 1)(ax+ b)= 15ax+ (15b- a)x- b so we must have a*15= 15, b*1= 4. In that case, is 15b- a= 17?

    (And I agree with Prove It- please state the full problem in the first post. Don't make us guess what it is.)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. factors
    Posted in the Number Theory Forum
    Replies: 3
    Last Post: April 7th 2010, 07:26 AM
  2. Replies: 1
    Last Post: December 7th 2009, 10:42 AM
  3. sum of factors
    Posted in the Number Theory Forum
    Replies: 3
    Last Post: June 25th 2009, 06:23 AM
  4. Factors of 2310 and Factors of 1365
    Posted in the Algebra Forum
    Replies: 1
    Last Post: October 7th 2008, 06:56 PM
  5. Factors
    Posted in the Algebra Forum
    Replies: 1
    Last Post: December 4th 2007, 04:37 AM

Search Tags


/mathhelpforum @mathhelpforum