A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

Using complete sentences, explain how to find the zeros of the function f(x) = 2x^3 – 9x + 3. I don't understand, please help me

  • This Question is Closed
  1. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Is it x^3? Or, x^2?

  2. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    its 2x^3

  3. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok....to find the zeroes you need to find the roots of the equation when f(x) = 0. So, set 2x^3 - 9x + 3 = 0. It is not obvious to me what the factors are in this case.

  4. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok now what?

  5. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    http://www.wolframalpha.com/input/?i=2x%5E3+-+9x+%2B+3+%3D+0

  6. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what does this mean? what am i looking for?

  7. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The three x values shown below are the "zeroes". Meaning the value of the function is zero for those values of x.

  8. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the zeroes of a function are where the y value is zero hence you set the function equal to zero. 0 = 2x^3 - 9x + 3. This function will not factor nicely so I would probably use a graphing calculator to find the zeroes.

  9. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh so to find the zeros mean the x-intercepts?

  10. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes. :)

  11. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeeep

  12. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok so am i allowed to use the graphing technology, or is there a way to do it without it?

  13. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    hmmmm.......factoring that function is nearly impossible (at least for me). So....

  14. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok thank you so much guys

  15. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.