What is the true solution to 2 In x=2 in 8

Mathematics · Middle School · Thu Feb 04 2021

Answered on

Answer: The equation you've provided uses "In" which typically denotes the natural logarithm and is usually represented as "ln" in mathematical expressions. Assuming that is what you mean, let's solve the equation `2 ln(x) = 2 ln(8)`.

First, let's simplify the equation. If on both sides of the equation the coefficients of the logarithm and the logs bases are the same, you can equate the arguments of the logs directly:

2 ln(x) = 2 ln(8)

Now we see that both sides of the equations are multiples of 2. We can simplify further by dividing both sides by 2:

ln(x) = ln(8)

Now, since the natural logarithm function (ln) is a one-to-one function (meaning for every x, there is a unique ln(x)), you can deduce that if ln(x) = ln(8), then x must be equal to 8.

Therefore, the solution to the original equation is:

x = 8

Extra: The natural logarithm is the logarithm to the base 'e', where 'e' is an irrational and transcendental constant approximately equal to 2.718281828459. The natural logarithm has special importance in mathematics due to its unique properties and its relationship to exponential functions.

The equation you have is an example of a logarithmic equation. In solving logarithmic equations, one commonly uses properties of logarithms such as the product, quotient, and power rules to combine or break down logarithmic expressions. Knowing that logarithmic functions are the inverses of exponential functions helps in converting between logarithmic and exponential forms, which can sometimes make solving equations easier.

Moreover, since the function ln(x) is strictly increasing—meaning that as x increases, ln(x) also increases—there is a one-to-one relationship between x and ln(x). This is why, when we have equal logarithms, we can deduce that the values they return the logarithm of must also be equal (as in ln(x) = ln(8) implies x = 8).