Math

ln(5x + 7) = 8

Not looking for an answer, I’m just stuck. Could someone give me the steps to solve this?

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  1. Remark:

    e ^ ln ( a ) = a

    So:

    e^ ln ( 5 x + 7 ) = 5 x + 7
    ____________________

    ln ( 5 x + 7 ) = 8

    Cancel logarithms by taking expof both sides.

    e^ ln ( 5 x + 7 ) = e ^ 8

    5 x + 7 = e ^ 8

    Subtract 7 to both sides

    5 x + 7 - 7 = e ^ 8 - 7

    5 x = e ^ 8 - 7

    Divide both sides by 5

    x = ( e ^ 8 - 7 ) / 5 = 1 / 5 ( e ^ 8 - 7 )

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  2. just ask ur teacher or math tutor

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