Solving Log Equation Double Integration - e^(e+1)

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In summary, The conversation is about solving the equation y=LN x and y=e+1-x. The attempt at a solution shows that x = e is a possible solution but the speaker is unsure if it can be solved analytically. The question is originally about double integration and finding the area bounded by the two functions.
  • #1
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Homework Statement



Do anyone know how to solve:
y=LN x
y=e+1-x


Homework Equations




y=LN x
y=e+1-x



The Attempt at a Solution



LN x=e+1-x
x=e^e * e^1 / e^x
x*e^x=e^(e+1)

then I don't know how to solve, must I solve it graphically?

Actually, the original question is :
Double integration
InIn x dxdy for the area bounded by y=e+1-x and y=LNx and x-axis
 
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  • #2
Trial and error shows [itex]x = e[/itex] is a solution to [itex]\ln{x} = e + 1 - x[/itex]. Closer inspection reveals the solution is unique because [itex]\ln{x}[/itex] is strictly increasing while [itex]e + 1 - x[/itex] is strictly decreasing.

I know not of an elementary technique for solving such an equation.
 
  • #3
Thanks a lot.
 

FAQ: Solving Log Equation Double Integration - e^(e+1)

What is a log equation?

A log equation is an equation that contains a logarithm function. Logarithms are the inverse of exponential functions and are used to solve for the unknown variable in an equation.

What does double integration mean?

Double integration is a mathematical technique used to find the area under a curve by breaking it into smaller sections and calculating the sum of these sections. It is essentially integrating twice, once to find the area between the curve and the x-axis, and then again to find the total area under the curve.

How do you solve a log equation with double integration?

To solve a log equation with double integration, you first need to rewrite the equation in terms of exponential functions. Then, use the properties of logarithms to simplify the equation. Finally, use the double integration technique to find the area under the curve and solve for the unknown variable.

What is the role of e in the equation?

The number e, also known as Euler's number, is a mathematical constant that is approximately equal to 2.71828. It is used in the equation because it is the base of the natural logarithm and is commonly used in mathematical and scientific calculations.

Can you provide an example of solving a log equation with double integration?

Sure, let's take the equation log(x) = e^2. First, we rewrite it as x = e^(e^2) using the property log(a^b) = b*log(a). Then, we use double integration to find the area under the curve of y = e^(e^2) from x = 1 to x = e^(e^2). This gives us the value of x, which is approximately 1618.56.

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