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

careless850 Group Title

Harry is trying to solve the equation y = 2x^2 − x − 6 using the quadratic formula. He has made an error in one of the steps below. Find the step where Harry went wrong.

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    • 2 years ago
  2. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    First of all, do you know what the quadratic formula is?

    • 2 years ago
  3. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes.

    • 2 years ago
  4. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I wrote this problem out 6 times, still can't see WHERE he went wrong.

    • 2 years ago
  5. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    What are you corresponding 'a', 'b' and 'c' for this quadratic when you compare it with the standard equation of a quadratic "ax^2 + bx +c=0"?

    • 2 years ago
  6. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    A = 2. B = -1. C = -6.

    • 2 years ago
  7. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[1 \pm \sqrt{-1^{2}} - 4*2*-6\]

    • 2 years ago
  8. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    -12 * -4 = 48. 1*1 = 1. \[1 \pm \sqrt{1-48 } \div 2\]

    • 2 years ago
  9. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    So it would be

    • 2 years ago
  10. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Step 3?

    • 2 years ago
  11. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    STEP 2!!!

    • 2 years ago
  12. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    He + instead of -.

    • 2 years ago
  13. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Should be : \[x = \frac{-(-1) \pm \sqrt{(-1)^2 - 4 \times 3 \times (-6) }{} }{2\times 2 }\]

    • 2 years ago
  14. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    No, it'd be -6.

    • 2 years ago
  15. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    -4 * 2 * -6.

    • 2 years ago
  16. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    actually the second step itself ha the error. (-1)^2 = 1 and yes that would be -4*2*-6 --> typo my bad.

    • 2 years ago
  17. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    *has

    • 2 years ago
  18. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    So, it's step 2, right?

    • 2 years ago
  19. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Yup!

    • 2 years ago
  20. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I have one more question.

    • 2 years ago
  21. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    And please ask questions in the correct subject forum :)

    • 2 years ago
  22. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Sure, just post it as a new one!

    • 2 years ago
  23. careless850 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Oh wow, I didn't realize I was in biology

    • 2 years 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.