Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

careless850

  • 2 years ago

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.

  • This Question is Closed
  1. careless850
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

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

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

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

    Yes.

  4. careless850
    • 2 years ago
    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.

  5. apoorvk
    • 2 years ago
    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"?

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

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

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

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

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

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

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

    So it would be

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

    Step 3?

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

    STEP 2!!!

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

    He + instead of -.

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

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

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

    No, it'd be -6.

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

    -4 * 2 * -6.

  16. apoorvk
    • 2 years ago
    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.

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

    *has

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

    So, it's step 2, right?

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

    Yup!

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

    I have one more question.

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

    And please ask questions in the correct subject forum :)

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

    Sure, just post it as a new one!

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

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

  24. Not the answer you are looking for?
    Search for more explanations.

    Search OpenStudy
    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.