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

LilVeroDez13

Counterexample problem.. jus want to know if its right. Thanks!

  • one year ago
  • one year ago

  • This Question is Closed
  1. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    x = 1

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

    that looks right:)

    • one year ago
  3. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    thanks! :)

    • one year ago
  4. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    it's not right

    • one year ago
  5. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    what would happen if you plugged in x=1 ? you get\[x^2\ge1\implies x\ge1\]\[1^2\ge1\implies1\ge1\]where is the falsehood here?

    • one year ago
  6. myininaya
    Best Response
    You've already chosen the best response.
    Medals 1

    I agree with @TuringTest 1 does equal 1.

    • one year ago
  7. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    ohh yeah.. it wouldnt b false.

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

    but its saying OR equal to

    • one year ago
  9. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    and it is equal, so it's true

    • one year ago
  10. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    @Emah yeahh thats true.. i dont see another answer that works

    • one year ago
  11. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    try each one individually

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

    oh oops i sdidnt see the part that said couterexample:( sorry

    • one year ago
  13. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    ohh its okk

    • one year ago
  14. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    what do you get when you plug in x=2\[x^2\ge1\]\[x\ge1\]are both still true?

    • one year ago
  15. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    i get that its false

    • one year ago
  16. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    which part is false?

    • one year ago
  17. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    first part

    • one year ago
  18. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    \[2^2\ge1\]is not true you say?

    • one year ago
  19. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    Im confused

    • one year ago
  20. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    we need to find an example where the first part is true, and the second part is false to disprove the statement

    • one year ago
  21. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    \[2^2=4\]and four is greater than one, so \[x^2\ge1\]is true for x=2

    • one year ago
  22. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    what about the other part, is\[2\ge1\]?

    • one year ago
  23. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    its true because 2 is greater tha 1

    • one year ago
  24. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    right, so both statements are true for x=2, so this is not a counterexample

    • one year ago
  25. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 1

    what about for x=-3 is\[x^2\ge1\]and is\[x\ge1\]?

    • one year ago
  26. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    first one is 9 > 1 (true) second one is 3 > 1 (true too)

    • one year ago
  27. LilVeroDez13
    Best Response
    You've already chosen the best response.
    Medals 0

    so than its 1/4 (:

    • one year 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.