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f(x)=lg(2-7x)

 Jan 19, 2021
 #1
avatar+11086 
+2

hello pls someone help me

f(x)=lg(2-7x)

 

Hello mongoloco!

Are you looking for the zero point ?!

 

\(f(x)=lg(2-7x)=0\)  |  de-logaritmize

\(2-7x=10^0\)                  |  \(\mathbb R^0\in \{1\}\) 

\(2-7x=1\)                      |  -2

\(-7x=1-2\)                   | \(\times (-1)\)

\(7x=1\)                              |  / 7

\(x=\dfrac{1}{7}\)

greeting

laugh  !

 Jan 19, 2021
 #2
avatar+8456 
+1

What do I do with this function? 

 

Find the derivative? Find the domain? Please specify.

 Jan 19, 2021

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