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

sasogeek Group Title

what does absolute value mean?

  • 2 years ago
  • 2 years ago

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

    mathematical description or layman description?

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

    |x| --> x if x>0, or -x if x<0

    • 2 years ago
  3. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    wha...? :s i'm lost

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

    lol that's the mathematical description. in layman terms, if x is positive, like 4, then the absolute value of it is 4. if x is negative, like -5, then the absolute value of it is 5.

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

    how do u determine it?

    • 2 years ago
  6. EulerGroupie Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Do you have an example?

    • 2 years ago
  7. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    find the absolute value of x

    • 2 years ago
  8. EulerGroupie Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I liked @Shadowys 's description.

    • 2 years ago
  9. EulerGroupie Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    His mathematical description was a great answer for your question.

    • 2 years ago
  10. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i know if i have |x| the solution is |x|=x that i know. my question is, how do you arrive at that conclusion... proof?

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

    it's the definition. the proof is the first line i gave you. the mathematical description.

    • 2 years ago
  12. EulerGroupie Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    It's only x if x is positive. It is -x if x is negative. It's one of those things that is so simple that it becomes tricky again. Say we are looking for |x| and x is -4... the answer is 4... but from the perspective of the original x, the answer is -(-4)=4.

    • 2 years ago
  13. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    google: "The magnitude of a real number without regard to its sign" i don't see that in ur description/definition/proof.... there's nothing related to magnitudes :/

    • 2 years ago
  14. EulerGroupie Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I've never seen a more rigorous proof than the piece-wise description given by @Shadowys . The literal meaning is: distance from the origin.

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

    i.e. that's the layman terms. also, i.e. that's in terms of vectors. |-4|-->4 |-2|-->2 |-x|-->x, for x>0

    • 2 years ago
  16. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i don't think it's enough to settle with |x|=x, |-z|=z ...

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

    yes. it is not.

    • 2 years ago
  18. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    it doesn't make sense

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

    |x| --> x if x>0, or -x if x<0 this is the definition. in fact, it's called the absolute value function. that means it must be like that. MUST

    • 2 years ago
  20. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    why?

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

    there is no why in this. it is defined that way. the reason you're learning this because this particular function has importance in geometrical analysis.

    • 2 years ago
  22. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    let's just say there is a why. there's a reason for everything, if not i could just make my own math rules and say everyone MUST follow that rule.... unless u don't know the answer to the why in this... :/

    • 2 years ago
  23. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @Zarkon

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

    yes. you can make your own rules, if they have an importance in something and if they conform to the original rules of mathematics.

    • 2 years ago
  25. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    well i'm still not satisfied with the given answer.

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

    if x<0 then x is negative...so -x is positive thus |x|=-x

    • 2 years ago
  27. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @Shadowys would you say that |y+1|=y+1?

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

    only if \(y+1\ge0\)

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

    if \(y+1<0\) then \(|y+1|=-(y+1)\)

    • 2 years ago
  30. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    what's with the magnitude mentioned in the definition by google?

    • 2 years ago
  31. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    magnitude is distance... right?

    • 2 years ago
  32. EulerGroupie Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    From a linear geometric perspective, yes. If we are talking about pressure, for example, not really.

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

    the absolute value of a number is its distanceto the origin

    • 2 years ago
  34. sasogeek Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    okay now this makes more sense than the earlier explanation/definition... thanks :)

    • 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.