Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

GiggleSquid

  • 3 years ago

What is the solution set or set notation for |7x+21|<-7

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

    hint: solve for x in 7x + 21 < -7 AND 7x + 21 > 7 does that help?

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

    Wait, what? An absolute value inequality doesn't have a negative on its right-hand-side!

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

    This is a false statement, and does not satisfy for all \(x\).

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

    How can an absolute value be less than -7 when absolute value of anything is a positive number?

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

    Do u know the defination of modulas?

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

    IF not then PLZ LOOK AT THIS: let x be any real number. Then the absolute value of x, denoted by IxI, is a non negative real number defined by |dw:1343557688022:dw|

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

    Nope. \(|-x| =x \qquad |x| = x \)

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

    so, when 7x+21>= 0 then 7x + 21 < -7 x<-4 AND when 7x+21<0 then -(7x+21)<-7 x >-2

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

    Oh yes.

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

    @sauravshakya now subsitute your answer in the question.. does it seem to satisfy? I already posted this solution.. however @ParthKohli forced me (using logic) to delete it.

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

    YA IT SATISFIES @bhaweshwebmaster

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

    teach me how.. I don't see it..

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

    OH. sorry @bhaweshwebmaster actually there is no solution.... since I 7x+ 21 I >=0

  14. 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