A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

iwanttogotostanford

  • one year ago

NEED HELP ASAP PLEASE: Solve x^2 + 8x − 3 = 0 using the completing-the-square method. x = four plus or minus the square root of three x = negative four plus or minus the square root of three x = four plus or minus the square root of nineteen x = negative four plus or minus the square root of nineteen

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

    @pooja195 @Nnesha

  2. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    complete the square is: turn this \(\large ax^2 + bx + c = 0\) into this \(\large a(x+d)2 + e = 0\) remember: \(\Large d = \frac b{2a} \) \(\Large e = c - \frac{b^2}{4a}\)

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

    so it would be C right???

  4. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    your equation is: \(\large x^2 + 8x + (-3) = 0\) so turn it into this: \(\large a(x+d)2 + e = 0\) by first solving: \(\Large d = \frac b{2a} =???\) \(\Large e = c - \frac{b^2}{4a} = ??? \)

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

    ok, and i go C

  6. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    correct, C

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

    it is really? i did it right?:-D

  8. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yep

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

    tjanks!

  10. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    np

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

    could you help with one more? @Jack1

  12. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    wait... neg 4 negative 4! dammit, sorrt D not C

  13. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    *sorry ;(

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

    aww ok:-( thanks again! can i ask you one more

  15. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    sure

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

    Using the completing-the-square method, find the vertex of the function f(x) = –2x^2 + 12x + 5 and indicate whether it is a minimum or a maximum and at what point. Maximum at (–3, 5) Minimum at (–3, 5) Maximum at (3, 23) Minimum at (3, 23)

  17. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ok, so have u completed the square?

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

    yes

  19. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    and ur equation is now...?

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

    2x^2+35x?

  21. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    no. what are a, b and c in ur original equation?

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

    X2 8 -2

  23. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    no. \(\large ax^2 + bx + c = 0\) \(\large 2x^2 + 12x + 5 = 0\) so a is 2 b is 12 c is 5... right?

  24. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    u with me?

  25. Jack1
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    r u still there?

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

    yes! sorry what now? @jack1

  27. 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.