Results 1 to 2 of 2

Math Help - Simple Factoring Question

  1. #1
    Masterigor
    Guest

    Simple Factoring Question

    Hello, I need to factor 4x^4-5x^2-9 and I'm not sure how to do it.
    The closest I got was:
    (2x^2+3)(2x^2-3)-5X^2

    but I wasn't sure what do do with the -5X^2. I also tried:

    4x^4-5x^2-9
    X^2(4x^2 -5)-3^2

    But then I wasn't sure what to do with the 9. Can someone please direct me as to what I am doing wrong or how to do the problem? Thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by Masterigor View Post
    Hello, I need to factor 4x^4-5x^2-9 and I'm not sure how to do it.
    The closest I got was:
    (2x^2+3)(2x^2-3)-5X^2

    but I wasn't sure what do do with the -5X^2. I also tried:

    4x^4-5x^2-9
    X^2(4x^2 -5)-3^2

    But then I wasn't sure what to do with the 9. Can someone please direct me as to what I am doing wrong or how to do the problem? Thanks
    did you notice that this was a quadratic in x^2 ?

    4x^4 - 5x^2 - 9 = 4(x^2)^2 - 5(x^2) - 9
    if we let x^2 = y, we get:

    4y^2 - 5y - 9
    can you take it from here?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Simple Factoring Problem
    Posted in the Number Theory Forum
    Replies: 2
    Last Post: October 19th 2010, 09:55 PM
  2. Replies: 4
    Last Post: December 9th 2009, 04:48 AM
  3. Replies: 3
    Last Post: October 25th 2009, 02:32 PM
  4. [SOLVED] simple factoring question
    Posted in the Algebra Forum
    Replies: 1
    Last Post: February 10th 2009, 04:15 PM
  5. Simple Factoring question that is bugging me
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: June 12th 2008, 05:58 PM

Search Tags


/mathhelpforum @mathhelpforum