A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Which of the following represents the zeros of f(x) = x3 − 5x2 − 3x + 15? 5, square root of 3, −square root of 3 −5, −square root of 3, −square root of 3 5, −square root of 3, −square root of 3 −5, square root of 3, square root of 3

  • This Question is Closed
  1. Jhannybean
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    \[f(x) = x^3-5x^2-3x+15=0\]\[f(x) = x^2(x-5) +3(x-5) = 0\]\[f(x) = (x^2+3)(x-5)=0\]\[x^2+3=0 \qquad x=~?\]\[x-5=0 \qquad x=~?\]

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

    X=-3 X=5

  3. Jhannybean
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    You've got one right

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

    X^2=-3?

  5. Jhannybean
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    \[x^2+3=0 \implies x^2=-3\]\[x= \pm i\sqrt{3}\]Your answer choices are kind of weird.

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

    so its A then right

  7. Jhannybean
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Oh I think Im the one that made the mistake.

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

    wait how

  9. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    yes it's x^2 - 3

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

    so it would still be A then right

  11. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    ya

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

    ok thank you

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

    do you mind helping me with one more?

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

    @Jhannybean @ParthKohli

  15. Jhannybean
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    correction: \((x^2-3)(x-5)=0\)

  16. Jhannybean
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    It wouldnt let me post. -_-

  17. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    i know that feel

  18. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Which of the following represents the zeros of f(x) = x3 − 14x2 + 61x − 84? 7, 4, −3 7, 4, 3 7, −4, −3 7, −4, 3

  19. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i believe it would be B

  20. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Look at the choices. We know that \(7\) is definitely a zero. Divide the thing by \(x - 7\). The remaining is a quadratic polynomial that can be factored.

  21. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    or just plug in the choices lol idk who cares

  22. ParthKohli
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Vieta's Formulas @Jhannybean :)

  23. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (x - 3) • (x - 4) • (x - 7)

  24. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i got this

  25. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so would it be B

  26. Jhannybean
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    =__=.... VF. How would that work here? we have one root = \((x-7)\) Then we'd find \(\alpha +\beta \) and \(\alpha\beta\) ?

  27. Jhannybean
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    @ParthKohli darn it you logged.

  28. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @ganeshie8

  29. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    srry i have to go

  30. Jhannybean
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Np :)

  31. 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.