SOLUTION: How to find the value of a number if its missing from the calculator? Example... log7?

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Question 751230: How to find the value of a number if its missing from the calculator? Example... log7?
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
use log conversion formula:

log%28a%2Cb%29=log%28c%2Ca%29%2Flog%28c%2Cb%29
where c=e or c=10 (because those bases are commonly on the calculator)
so for example
log%287%2C12%29=log%2812%29%2Flog%287%29

:)