Sunday, November 1, 2015

i want to know what x is in the logaritme below: 3log x + 2 log 3x= 3 the answer is 3 but how do you get this answer thank you

First, we'll have to precise that we work with decimal
logarithms.


Now, we'll use the power property of
logarithms:


3log x = log
x^3


2 log 3x = log
(3x)^2


Now, we'll re-write the
equation:


log x^3 + log (3x)^2 =
3


Because the bases of logarithms are matching, we'll use
the product property of logarithms: the sum of logarithms is the logarithm of the
product.


 log x^3 + log (3x)^2 = log
[x^3*(3x)^2]


log [x^3*(3x)^2] =
3


We could write the term from the right side
as:


3 = 3*1 = 3* log10


The
equation will become:


log [x^3*(3x)^2] = 3*
log10


log [x^3*(3x)^2] =
log10^3


Because the bases are matching, we'll use the one
to one property:


x^3*(3x)^2 =
1000


9*x^(3+2) = 1000


9x^5 =
1000


We'll divide by 9:


x^5 =
1000/9


x^5 = 111.111 approx.


x
= (111.111)^1/5 approx.

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