Please help me here!!! Maths

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Isolve for x: ln(x^2-6x-16)= 0 . help me beacuse I do not have the idea to work it out.

  • Please help me here!!! Maths -

    Solve for the value of x: ln(x^2-6x-16)=5. Please help me work it out because I do not have an idea in work it out.

  • Please help me here!!! Maths -

    (x^2-6x-15)=e^5

    e^5 is approximately 148.41

    so x^2-6x=148.41-15

    x^2-6x = 133.41

    x-6x = sqrt(133.41)

    -5x = 11.55

    x = 11.55/-5

    x = 2.31

  • no - Please help me here!!! Maths -

    unfortunately Sunny made several errors,
    Try to sub in x = 2.31, it does not work

    form his/hers : (x^2-6x-16)=e^5 ---- Sunny had -15

    x^2 - 6x = 148.413 + 16
    complete the square by adding 9 to both sides
    x^2 - 6x + 9 = 148.413+16+9 = 173.413
    (x-3)^2 = 173.413
    x-3 = ±√173.413 = ± 13.1686

    x = 3 ± 13.1686
    x = 16.1686 or x = -10.1686

    both work when subbed into the original equation

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