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Logarithms

posted by on .

Hi,

Can anyone tell me if the following are correct please:-

If x = 10y (where x > 0), then log10 x = y

if a and b are positive numbers, then,

2 log 10 a / b = 2log 10 a - 2 log 10 b

and lastly

if a and b are positive numbers, then,

log 10 ( a+b ) = 10 log 10 a + log 10 b

Thanks.......

:-)

  • Logarithms - ,

    You have a typo in
    "If x = 10y (where x > 0), then log10 x = y "

    should say: If x = 10^y (where x > 0), then log10 x = y

    the second one is right

    the third one is wrong

    log (a+b) cannot be split up

    your answer of 10 log 10 a + log 10 b would be
    log10[(a^10)(b)]

  • Logarithms - ,

    thank you

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