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

DeadShot

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

  • one year ago
  • one year ago

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

    try factoring :)

    • one year ago
  2. DeadShot
    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)?

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

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

    • one year ago
  4. RONNCC
    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

    • one year ago
  5. ZakaullahUET
    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

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

    ok

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

    |dw:1359226096145:dw|

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

    |dw:1359226195996:dw|

    • one year ago
  9. ZakaullahUET
    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

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

    ok

    • one year ago
  11. ZakaullahUET
    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,

    • one year ago
  12. ZakaullahUET
    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

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

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

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

    ok sigh i don't know what he was doing

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

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

    • one year ago
  16. RONNCC
    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

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

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

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

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

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

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

    • 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.