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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
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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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