solve the following equation for the value x:?

solve the following equation for the value x: (log x^3) = log x^3

reza2008-06-29T22:46:37Z

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I think you mean (logx)^3=log (x^3)
log(x^3)=3log x
log x=a then
a^3=3a
a^3-3a=0
a(a^2-3)=0
If a=0 then log x=0 and x=1
If a^2-3=0 then a^2=3 and a= + or - (3sqert)
If a=(3sqrt) then log x=(3 sqrt) and x=(base)^(3sqrt)
If a=-(3sqrt) then logx=-(3sqrt) and x=(base)^(-3 sqrt)

ksuex972008-06-29T22:40:59Z

log x^3 = log x^3 is like saying 4 = 4. When both sides of the equation are identical, the equation is always true. It won't matter what you substitute for x.

So the answer is "all real solutions" or "all solutions" depending on the book or teacher.

Jimmy2008-06-29T22:46:31Z

Your notation is slightly confusing, but I'm going to assume that it is equivalent to log(x^3) = (log x)^3

In this case, using a logarithmic identity gives us log(x^3) = 3*log(x)
thus, we get 3(log x) = (log x)^3
dividing by log x, we get 3 = (log x)^2
take the square root to get log x = sqrt(3)
from there, x = 10^(sqrt(3)), which is approximately 10^1.73205081 or 53.9573746

sahsjing2008-06-29T22:38:18Z

(log x^3) = log x^3
The solution is for all x > 0.

If you mean (log x)^3 = log x^3, then
(log x)^3 - 3log x = 0, x > 0
log x [(log x)^2 - 3] = 0
log x = 0, => x = 1
log x = ±√3, => x = 10^[±√3]

Romy C2008-06-29T22:41:09Z

(log x^3) = log x^3
log x^3 = log x^3
but x cannot be 0 or negative since logx where x<= 0 is undefined thus,

x>0

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