this may as well be chinese to me, so im not sure how to be more descriptive=(

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You're given this on your 1st day...by a teacher who gave no explanation? (Doh)
  • August 27th 2012, 06:19 PM
    MaxJasper
    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(
    | means "given that" ...so
    find set of values of x given that | .......x<=17/4
  • August 27th 2012, 06:24 PM
    sloupok
    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(
    Quote:

    Originally Posted by Wilmer View Post
    You're given this on your 1st day...by a teacher who gave no explanation? (Doh)

    yes exactly.

    i was able to complete every other question on the assignment correctly with average of 97.6; excluding the problem given in OP, the assignment was easily understood
    examples:
    http://i.imgur.com/z7bB1.jpg
  • August 27th 2012, 06:28 PM
    sloupok
    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(
    Quote:

    Originally Posted by MaxJasper View Post
    | means "given that" ...so
    find set of values of x given that | .......x<=17/4


    so "x is less than or equal to -4.25"?

    what does the fraction -17/4 inbetween || mean?
  • August 27th 2012, 07:33 PM
    Prove It
    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(
    |-17/4| means the ABSOLUTE VALUE or SIZE of -17/4. In other words, it's asking you how far away is -17/4 from 0?
  • August 27th 2012, 07:46 PM
    sloupok
    Re: Prove It
    so the actual charge is irrelevant to the solution?

    just that the value of x is less than or equal to the difference to zero(+/-) of the value of the given?

    so the answer set (-infinity,4.25) -Plato; is a ray from point (4.25,0) towards negative, infinitely along the x axis?
  • August 27th 2012, 07:48 PM
    Prove It
    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(
    No, the absolute value is a DISTANCE. You can only ever have a POSITIVE value for a distance (so it turns all numbers positive). Therefore |-17/4| = 17/4, and the set x <= |-17/4| is the same as x <= 17/4. So in interval notation your answer is (-infinity, 17/4].
  • August 27th 2012, 08:06 PM
    sloupok
    Re: this may as well be chinese to me, so im not sure how to be more descriptive=(
    thank you all =D