Equation Without a Solution

Discussion in 'Algebra' started by nycmathguy, Jan 5, 2022.

  1. nycmathguy

    nycmathguy

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    Why does the following equation have no solution?

    Screenshot_20220104-234045_Samsung Notes.jpg
     
    nycmathguy, Jan 5, 2022
    #1
  2. nycmathguy

    MathLover1

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    (3x)/(x-1)+2=3/(x-1)

    (3x)/(x-1)+2(x-1)/(x-1)=3/(x-1)

    (3x+2(x-1))/(x-1)=3/(x-1)

    (3x+2x-2)/(x-1)=3/(x-1).......since denominator cannot be zero, x=1 is excluded from domain

    then
    3x+2x-2=3
    5x-2=3
    5x=3+2
    5x=5
    x=1...........since x=1, cannot be solution because it is excluded from domain

    so, No Solution
     
    MathLover1, Jan 5, 2022
    #2
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  3. nycmathguy

    nycmathguy

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    An equation without a solution can be defined as empty set. Yes?

    If an equation has no solution it means that it has no roots. Yes?
     
    nycmathguy, Jan 5, 2022
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  4. nycmathguy

    Country Boy

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    I am not crazy about the wording here. An equation is NOT a set!

    You mean that the set of all solutions to this equation (its "solution set") is empty.

     
    Country Boy, Jan 5, 2022
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  5. nycmathguy

    MathLover1

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    If an equation has no solutions, we write ∅ for the solution set. ∅ means the null set (or empty set). Sometimes, you may be given a replacement set, and asked to test whether the equation is true for all values in the replacement set.
    it means that it has no roots
     
    MathLover1, Jan 5, 2022
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  6. nycmathguy

    nycmathguy

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    Some textbooks, if memory serves me right, use the words EMPTY SET referring to an equation without a solution(s). I also don't agree or like the wording. Perhaps the way you phrased it is the correct statement found in certain textbooks.
     
    nycmathguy, Jan 6, 2022
    #6
  7. nycmathguy

    nycmathguy

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    By no roots you mean no solutions, no values. Yes?
     
    nycmathguy, Jan 6, 2022
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