A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

What is the x-coordinate of the vertex of the parabola whose equation is y = 3x2 + 9x?

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

    the x-coordinate of the vertex of y = ax^2 + bx + c is given by: x = -b/(2a).

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

    y = 3x^2 + 9x = 3x^2 + 9x + 0

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

    a = 3, b = 9, and c = 0

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

    the x-coordinate of the vertex is: x = -b/(2a) = -9/[2(3)] = -3/2 = -1 1/2

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

    -3 -1 - this are the answer choices @EllenJaz17

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

    What's the last option? It's just a negative sign

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

    no its -2 over 3 -2/3

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

    and so is the second answer is -1 and 1 over 2 somethuing like this -1 1/2

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

    Its -3/2

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

    y = 3x^2 + 9x y = 3(x^2 + 3x + 9/4) - 27/4 y = 3(x + 3/2)^2 - 27/4 From this, we can see a low point and vertex when: x = -3/2 because that's when the first term is smallest. So, x = -3/2

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

    thanks:)

  12. 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.