Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

DeadShot

  • one year ago

Determine the zeros of f(x) = x3 - 12x2 + 28x - 9.

  • This Question is Closed
  1. RONNCC
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    try factoring :)

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

    so, I'd remove the x^2 from the first two terms, making it x^2 (x - 12 + 28x - 9)?

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

    and then combine like terms, making it x^2 (29x - 21)

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

    ... you can't just remove x^2 from the front. what about the back? you get x^2(x - 12) + 28x - 9

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

    start by hit and tril, put x=1, -1, 2, -2 till u get f(x)=0

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

    ok

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

    |dw:1359226096145:dw|

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

    |dw:1359226195996:dw|

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

    try ur self till u get f(x)=0 after that v proceed next

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

    ok

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

    let "a" is that value i-e f(a)=0 means "a" is a root and x-a is a factor, now divide the original equation by x-a to get another factor(that will b quadratic, factorize that and equate the three factors one by one to get the roots,

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

    my laptop battery is low , m about to offline if i didnt reach power on time, good luck for the question

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

    I couldn't find any numbers that made f(x)=0

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

    ok sigh i don't know what he was doing

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

    but via factoring you get (x-9)(x^2-3x+1)

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

    therefore x = 9 and you use the quadratic formula to find the roots for x^2 - 3x + 1

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

    I'm having trouble using the quadratic formula with (x^2 - 3x + 1)

  18. satellite73
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[a=1,b=-3,c=1\] \[x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\]

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

    so, a=1, b=-3, and c=1?

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

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.