Solving Natural Log: Round and Round I Go...

In summary, a natural logarithm (ln) is the inverse function of the exponential function and is used to find the time needed for growth or to model real-world situations. We use natural logs to solve exponential growth or decay problems and convert between exponential and logarithmic equations. To solve a natural log equation, we isolate the ln term and exponentiate both sides with e. The main difference between ln and log is the base of the logarithm. Common mistakes when solving natural log equations include not isolating the ln term, not exponentiating both sides, and not simplifying the equation enough. It is also important to check for extraneous solutions.
  • #1
member38644
when trying to solve

ln(x+4)=2

i tried this

ln(x+4)=2
e^2=(x+4)
ln e^2=ln(x+4)
2=ln(x+4)

and round and round i go... where do i start to go wrong?
 
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  • #2
Welcome to physicsforums fieldlandman,

you actually went the right way till the second line:

fieldlandman said:
when trying to solve

ln(x+4)=2

i tried this

ln(x+4)=2
e^2=(x+4)

Continue there with solving FOR x!
 
  • #3
thanks!

that was it! thanks!
 

FAQ: Solving Natural Log: Round and Round I Go...

What is a natural log?

A natural logarithm, or ln, is the inverse function of the exponential function. It is used to find the time needed to reach a certain level of growth, or to find the time when an initial value will reach a certain final value when continuously growing at a certain rate.

Why do we use natural logs?

Natural logs are used to solve exponential growth or decay problems, as well as to model many real-world situations such as population growth, radioactive decay, and interest rates. They allow us to easily convert between exponential and logarithmic equations.

How do you solve a natural log equation?

To solve a natural log equation, isolate the ln term on one side of the equation and exponentiate both sides using e (Euler's number). Then, solve for the variable using algebraic techniques such as factoring or the quadratic formula.

What is the difference between ln and log?

The main difference between ln and log is the base of the logarithm. ln uses e as its base, while log typically uses base 10. This means that ln is more frequently used in scientific and mathematical contexts, while log is more commonly used in financial and business contexts.

What are some common mistakes when solving natural log equations?

Some common mistakes when solving natural log equations include not isolating the ln term, forgetting to exponentiate both sides, and not simplifying the resulting equation enough. It is also important to check for extraneous solutions, as natural logs do not allow for negative arguments.

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