Interval Notation to Inequality Notation

Discussion in 'Algebra' started by nycmathguy, May 25, 2022.

  1. nycmathguy

    nycmathguy

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    Screenshot_20220524-220407_Samsung Notes.jpg

    For 42, I got -2 < x < 2.

    For 44, I got -3/2 <= x <= 1/2.

    For 46, I got -4 < x <= 0.

    For 48, I got x > sqrt{2}.

    For 50, I got x => 0.

    For 52, I got x <= -1

    For 54, a capital bold letter R represents all real numbers.

    You say?
     
    nycmathguy, May 25, 2022
    #1
  2. nycmathguy

    MathLover1

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    42, 44, 46 correct

    For 48, you got x > sqrt{2} which is incorrect
    (sqrt(2), ∞) will be sqrt(2)< x < ∞

    50. 0 < x < ∞
    52. interval is ( - ∞, -2) so - ∞ < x< -2

    54, a capital bold letter R represents all real numbers-> correct
    you need to write it using
    Inequality Notation :
    - ∞ < x<
     
    MathLover1, May 25, 2022
    #2
    nycmathguy likes this.
  3. nycmathguy

    nycmathguy

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    Do you the importance of revisiting former topics?
    We return to Calculus this weekend.
     
    nycmathguy, May 26, 2022
    #3
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