- #1
Rectifier
Gold Member
- 313
- 4
Hey there!
How do I determine whether this function is growing or decreasing without using any calculator or graphing tools?
[tex]y=ln(\frac{1}{x})[/tex]
I know that
[tex]y=ln(\frac{1}{x}) \ \Leftrightarrow \ e^y=\frac{1}{x} \ \ \ (1) [/tex]
Then I tried to use the formula
[tex]f(x)=a^x[/tex] and then determine whether a is 0<a<1 or a>1. But I don't know how I should do to write (1) in the same same manner :( .
If a is 0<a<1 means that the function is strictly decreasing.
If a is a>1 means that the function is strictly increasing.
Could somone please help me?
How do I determine whether this function is growing or decreasing without using any calculator or graphing tools?
[tex]y=ln(\frac{1}{x})[/tex]
I know that
[tex]y=ln(\frac{1}{x}) \ \Leftrightarrow \ e^y=\frac{1}{x} \ \ \ (1) [/tex]
Then I tried to use the formula
[tex]f(x)=a^x[/tex] and then determine whether a is 0<a<1 or a>1. But I don't know how I should do to write (1) in the same same manner :( .
If a is 0<a<1 means that the function is strictly decreasing.
If a is a>1 means that the function is strictly increasing.
Could somone please help me?