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heineken_05
heineken_05 asked in Science & MathematicsMathematics · 1 decade ago

solving log base 10 problems?

I have a hard time solving the following problems, could someone help out please?

1. log10(x+6) - log10(x-3) = 1

2. log10(x-1) - log10(x+1) = 1

1 Answer

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  • Anonymous
    1 decade ago
    Favorite Answer

    1. glad I double check - SORRY

    log (x+6)/(x-3) = 1

    raise to 10th

    (x+6)/(x-3) = 10^1 = 10

    x+6 = 10x -30

    9x = 36

    x=4

    ---------

    2.

    almost same math

    x-1 = 10(x+1)

    x-1 = 10x +10

    9x = -11

    x = -11/9

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