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How to input if, then into an equation

Posted 10 years ago

If I wanted to solve:

if log_4 x=3, then log_8 x= 

I apologize if this has been asked and answered before

POSTED BY: charles mills
5 Replies

The syntax is the Wolfram Language and the output is generated by Mathematica. I'm surprised the Moderation Team didn't delete your comment, asking if it is MATLAB output.

POSTED BY: Frank Kampas
Posted 10 years ago

thanks for your help

POSTED BY: charles mills
Posted 10 years ago

Thanks for the responses, I was attempting to use the "search engine" on this site. I see that there is some sort of console that you are using, perhaps you can show me where I can find this? I am new to this site and I joined as my math skills are extremely under developed....I was wooed by the practice problem generator....Is this matlab output? I am extremely interested in this syntax and would love to see where you obtained this output. Thanks!

POSTED BY: charles mills

Even simpler

In[1]:= Solve[Log[4, x] == 3, x]

Out[1]= {{x -> 64}}

In[2]:= Log[8, 64]

Out[2]= 2
POSTED BY: S M Blinder
In[2]:= Solve[{res == Log[8, x], Log[4, x] == 3}, {res, x}]

Out[2]= {{res -> (3 Log[4])/Log[8], x -> 64}}

In[3]:= FullSimplify[%]

Out[3]= {{res -> 2, x -> 64}}
POSTED BY: Frank Kampas
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