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

AriM Group Title

Using the quadratic function, provide the x intercepts of x^2+4x-21 Can someone just tell me what the quadratic function is..?

  • 11 months ago
  • 11 months ago

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

    The quadratic function you have is x^2+4x-21 The graph will be a parabola

    • 11 months ago
  2. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    To find the x-intercepts, set your quadratic expression(function) equal to 0. Then solve for x.

    • 11 months ago
  3. AriM Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    hmm thats what i did @myininaya and i got x = -7 and 3 but the teacher wrote -2 and use quadratic function..

    • 11 months ago
  4. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    What is -2 suppose to be ? Your x-intercepts are correct for this quadratic function.

    • 11 months ago
  5. AriM Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh im just saying he took off 2 points and wrote use quadratic function.

    • 11 months ago
  6. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Does he mean formula?

    • 11 months ago
  7. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    The quadratic formula is \[x=\frac{-b \pm \sqrt{b^2-4ac}}{2a} \]

    • 11 months ago
  8. AriM Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    hmm ill try it.

    • 11 months ago
  9. AriM Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Thanks for your help

    • 11 months ago
  10. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Np. Good luck.

    • 11 months ago
  11. AriM Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    tnx

    • 11 months ago
  12. AriM Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh if you do the quadratic function you get 3 and -7. Can you check that for me? @myininaya

    • 11 months ago
  13. AriM Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    actually, never mind. I see his point but you could have just done (x+7) (x-3) and gotten the intercepts that way.

    • 11 months ago
  14. AriM Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    do you write it as (3,0) and (-7,0) though?

    • 11 months ago
  15. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Yep You could have factored or used the quadratic formula.

    • 11 months ago
  16. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    It is more proper to say the x-intercepts are (3,0) and (-7,0) I would say it is informal to say they are 3 and -7

    • 11 months ago
  17. AriM Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yea, i understand.

    • 11 months ago
  18. myininaya Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Coolness.

    • 11 months 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.