Wednesday, September 11, 2013

Solve for x log2 (x) +log3 (x)=1.

We'll change the bases of logarithms into the common base
10.


log2 (x) = log x/log
2


log3 (x) = log x/log 3


We'll
re-write the equation:


log x/log 2 + log x/log 3 =
1


We'll calculate the LCD = (log 2)*(log
3)


We'll multiply all over by (log 2)*(log
3):


(log 2)*(log 3)*(log x)/log 2 + (log 2)*(log 3)*(log
x)/log 3 = (log 2)*(log 3)


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


We'll factorize by log
x:


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


We'll apply the product property of
logarithms:


log x = (log 2)*(log
3)/log(2*3)


log x = (log 2)*(log 3)/log
6


Since the base is 10, we'll take antilog and we'll
get:


x = 10^[(log 2)*(log 3)/log
6]


The solution of the given equation is x =
10^[(log 2)*(log 3)/log 6].

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