1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Dividing polynomials question

  1. Mar 7, 2015 #1
    Mod note: Moved from a technical math section, so missing the template.

    I have this question and the answer but my mathXL does not show me how it came to this conclusion.

    (4s3+4s2 + 72)/ s+3

    I got all the way to the answer 4s2 - 8s

    The correct answer is 4s2 - 8s + 24

    I just don't know the steps to getting the +24, because when worked the problem, you cannot minus 72 from 24s.

    Anyone can help?
    Last edited by a moderator: Mar 7, 2015
  2. jcsd
  3. Mar 7, 2015 #2
    When you did your long division you might have left out the term with s in the numerator. When you work it out it should look like 4s3 + 4s2 + 0s + 72.
  4. Mar 7, 2015 #3
    YEs that was the problem! thank you fourier jr
  5. Mar 7, 2015 #4


    Staff: Mentor

    Check your division. Long division is difficult to type up on computers, so if you could take a picture of your work and post it, we could show you where you went wrong.
  6. Mar 7, 2015 #5

    Ray Vickson

    User Avatar
    Science Advisor
    Homework Helper

    You wrote
    [tex] \frac{4s^3+4s^2+72}{s} + 3, [/tex]
    which is very easy to complete. Did you really mean that, or did you intend
    [tex] \frac{4s^3+4s^2+72}{s + 3}\;? [/tex]
    If so, use parentheses, like this: (4s^3+4s^2+72)/(s+3). This is a bit harder than the problem you wrote.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted