Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

burhan101 Group Title

x intercept for this function

  • one year ago
  • one year ago

  • This Question is Closed
  1. burhan101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\huge y=x^3-9x^2+15x+4\]

    • one year ago
  2. burhan101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    this is unfactorable?

    • one year ago
  3. timo86m Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh no wait nevermind

    • one year ago
  4. SmoothMath Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Any particular method they want you to use? Do they specify factoring?

    • one year ago
  5. burhan101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    No but isnt that the only way?

    • one year ago
  6. SmoothMath Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Graphing is the easiest.

    • one year ago
  7. SmoothMath Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Graph that bad boy. Look for where it crosses the x axis. Doneso.

    • one year ago
  8. burhan101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    no i have to use an algebraic method

    • one year ago
  9. burhan101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    because like say on an exam, i cant graph that

    • one year ago
  10. Mertsj Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Possible rational roots are :

    • one year ago
  11. SmoothMath Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Okay then your best best is to use the rational root theorem to list possible rational roots. Then check each one to see if it is a valid root.

    • one year ago
  12. Mertsj Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\pm1,\pm4,\pm2\]

    • one year ago
  13. Mertsj Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Use synthetic division to see if any of those are actual roots.

    • one year ago
  14. SmoothMath Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Mertsj is correct. The way he got those possible roots is: A: Make a list of factors for the last number (In this case, it's 4) B: Make a list of factors for the first coefficient (In this case, it's 1) Possible rational roots must be of the form \(\huge \frac{\text{things in the first list}}{\text{things in the second list}}\)

    • one year ago
  15. Mertsj Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    It is not factorable.

    • one year ago
  16. Mertsj Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    So the best approach would be to find where y changes sign. Then you would know there is a root between those two values and you could hone in on it by trial and error. Of if you know calculus, you could use the derivative. What class is this for?

    • one year ago
  17. burhan101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @Mertsj calculus !

    • one year ago
  18. oldrin.bataku Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    they want you to bruteforce using newton's more than likely

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.