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

gjhfdfg Group Title

Finding x intercepts for quadratic functions

  • one year ago
  • one year ago

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

    I need help on finding the x intercept on this quadratic function, |dw:1360627184057:dw|

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

    do you know the formula? http://en.wikipedia.org/wiki/Quadratic_equation#Quadratic_formula

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

    I do now I think,

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

    Hold on,

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

    Ok, so I solve it like this? |dw:1360627636615:dw|

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

    almost, a= 6 not 6x^2

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

    that way you have a number :D

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

    What happens to the x^2?

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

    well: a,b and c are the coefficients so there's no need for x's. check the formula again. so you should have two solutions.

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

    Them 2 solutions got me lost..

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

    |dw:1360628346901:dw|

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

    I got that so far,

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

    it goes like this: \[x_{1,2} =\frac{-12\pm \sqrt{12^2-4\cdot 6 \cdot 5}}{6\cdot 2} = -1\pm \frac{\sqrt{24}}{12}=-1\pm\frac{2\sqrt{6}}{12}=-1\pm\frac{1}{\sqrt6}\] so we have : \[x_1 = 1+\frac{1}{\sqrt{6}}\] and x_2 = 1-\frac{1}{\sqrt{6}}

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

    i mean \[x_2= 1-\frac{1}{\sqrt{6}}\]

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

    ahem, yeah with -1 ... :)

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

    How did you get the\[\sqrt{24}\] ?

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

    \[12^2 - 4\cdot 6 \cdot 5 = 144 - 120 = 24\]

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

    Ah, ok I was thinking 12*12 = 120 instead of 144. My bad,

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

    But then how did \[2\sqrt{6}\] come in?

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

    The square roots throw me off...

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

    \[\sqrt{24}=\sqrt{4\cdot 6} =\sqrt{4} \cdot \sqrt{6} = 2\sqrt{6}\]

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

    Ah ok got it thanks.!

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

    you welcome :)

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

    Do we do anything else to it?

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

    what do you mean?

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

    Is there anything else I should do to the answer(s)? None of them match my answer choices

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

    hmm what are your choices?

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

    • one year ago
    1 Attachment
  29. Marx Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    so it's the second one: \[\frac{-6\pm \sqrt{6}}{6}\] it's basically what I told you but in a different form

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

    Ah ok thank you

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

    \[\frac{-6\pm\sqrt{6}}{6} = -1 \pm \frac{\sqrt{6}}{6} = -1\pm \frac{1}{\sqrt{6}}\]

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

    Got it.!

    • 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.