Determine whether the statement is true or false. If 0 < a < b, then Ln a < Ln b

Discussion in 'Calculator Requests' started by math_celebrity, Jun 12, 2020.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    Determine whether the statement is true or false. If 0 < a < b, then Ln a < Ln b

    We have a logarithmic property that states:
    ln(a) - ln(b) = ln (a / b)

    We're given a < b, so (a / b) < 1

    Therefore:

    ln (a / b) < 0

    And since ln(a) - ln(b) = ln (a / b)

    Then Ln(a) - Ln(b) < 0

    Add Ln(b) to each side and we get:
    Ln(a) - Ln(b) + Ln(b) < 0 + Ln(b)

    Cancel the Ln(b) on the left side and we get:
    Ln(a)<Ln(b)

    So this is TRUE

     
    Last edited: Jan 15, 2024

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