A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

I am doing quadratic functions Can someone help me solve this y=-2x^2+11x-12

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

    Solve it for y = 0? Are you familiar with the quadratic formula?

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

    yes but this is +or - a=-2,b=11 c=-12

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

    I know how to do the formula but have done 10 problems but don't come up with the correct answer

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

    Those are the correct values for a, b, and c.

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

    \[11+-\sqrt{(11^2-4(-2)(-12)}\]

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

    I have done the numbers in parenthesis first what do you come up with

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

    \(11^2 - 4(-2)(-12) = 25\)

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

    okay that is what I got

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

    x=4

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

    So you should have \(\frac{-11 \pm \sqrt{25}}{2(-2)}\)

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

    I have to have a + and - answer

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

    They could both be + or - depending on your other values.

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

    But you will have 2 unless the part under the sqrt is 0

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

    I have \[11+-\sqrt{25?}\div-4\]

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

    It should be -11, not 11. Recall that the quadratic formula is \[ax^2 + bx +c=0 \implies x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}\]

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

    i got x=-9 and -14 over-4

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

    okay that is right I have it in front of me

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

    x = (-11 + 5 )/(-4) = -6/-4 = 3/2 x = (-11 - 5)/(-4) = -16/-4 = 4

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

    if you let y be 0 than after you can write your equation as -2x^2+11x-12=0 or you can write this as 2x^2-11x+12=0 from this equation you can get the correct answer

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

    You won't have any negative values for the x intercepts of this graph.

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

    True I have been working on this too long I think thank you

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

    Certainly =)

  23. 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.