- #1
Juwane
- 87
- 0
Here is an equation:
[tex]x^3 + 1 = 3^x[/tex]
We have no problem of taking ln of both sides, right?
But if we write the equation as
[tex]x^3 - 3^x + 1 = 0[/tex]
Now let's take ln of both sides
[tex]ln ( x^3 - 3^x + 1 ) = ln (0)[/tex]
But ln (0) is undefined.
My question is: After just taking 3x to the other side, how does the equation become into a one of which we're not able to take the log of both sides?
[tex]x^3 + 1 = 3^x[/tex]
We have no problem of taking ln of both sides, right?
But if we write the equation as
[tex]x^3 - 3^x + 1 = 0[/tex]
Now let's take ln of both sides
[tex]ln ( x^3 - 3^x + 1 ) = ln (0)[/tex]
But ln (0) is undefined.
My question is: After just taking 3x to the other side, how does the equation become into a one of which we're not able to take the log of both sides?