Solving the Logarithmic Equation: \ln(x)^{\ln(x)} = x^\ln(\ln(x))?

In summary, the conversation discusses the equation \ln(x)^{\ln(x)} = x^\ln(\ln(x)) and its graph. It is noted that when x > 1, taking ln from both sides makes the equation true and when graphed, it forms a horizontal line starting from (1,0). However, when x < 1, the equation does not hold true and may not be easily graphed. It is suggested that the software used may not accurately show the logic involved in the equation, leading to confusion. Overall, the equation only holds a meaning when x > 1.
  • #1
Yegor
147
1
Is it right that [tex]\ln(x)^{\ln(x)} = x^\ln(\ln(x))[/tex]?
If i take ln from both sides it looks ok. but when i try to plot [tex]\frac{\ln(x)^{\ln(x)}}{x^\ln(\ln(x))}[/tex] or [tex]\ln(x)^{\ln(x)} - x^\ln(\ln(x))[/tex]? it doesn't gives me straight line. What is wrong?
 
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  • #2
What do you get if you take x < 1? However, if x > 1, then yes, if you take ln from both sides, they are equal. In fact, when I graph it, I get a horizontal line starting from (1,0) and going to the right. I used GCalc to graph it. You can do the same in case it is just a problem with whatever graphing tool you're using.
 
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  • #3
To give this expression ([tex]\ln(x)^{\ln(x)} = x^\ln(\ln(x))[/tex]) a meaning, x must be >1, then the statement is true.
And you'll have no problems in plotting it, in fact the software you used was not interested in showing you the logic puzzles it was involved in, thus tricking you.
 

FAQ: Solving the Logarithmic Equation: \ln(x)^{\ln(x)} = x^\ln(\ln(x))?

What is a logarithmic equation?

A logarithmic equation is an equation that contains one or more logarithmic terms. Logarithmic functions are the inverse of exponential functions and are used to solve problems involving exponential growth or decay. The general form of a logarithmic equation is logb(x) = y, where b is the base, x is the argument, and y is the value.

How do you solve a logarithmic equation?

To solve a logarithmic equation, you need to isolate the logarithmic term on one side of the equation and the non-logarithmic terms on the other side. Then, use the properties of logarithms to simplify the equation and solve for the variable. The final step is to check the solution by plugging it back into the original equation.

What are the properties of logarithms?

The properties of logarithms include the product property, quotient property, power property, and change of base property. The product property states that logb(xy) = logb(x) + logb(y). The quotient property states that logb(x/y) = logb(x) - logb(y). The power property states that logb(xy) = ylogb(x). The change of base property states that logb(x) = loga(x) / loga(b).

What is the difference between ln and log?

Both ln and log are logarithmic functions, but they have different bases. The base of ln is e, the natural logarithm, while the base of log is usually 10. This means that ln(x) is equivalent to loge(x) and log(x) is equivalent to log10(x).

How do you solve the logarithmic equation ln(x)ln(x) = xln(ln(x))?

To solve this equation, you can use the property that logb(xy) = ylogb(x). First, take the natural logarithm of both sides to get ln(ln(x)) = ln(x)ln(x). Then, substitute ln(x) with t and solve for t using algebraic methods. Finally, substitute back in ln(x) for t to get the final solution.

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