SOLUTION: Write 1 - 2log7x as a single logarithm.

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Question 737110: Write 1 - 2log7x as a single logarithm.
Answer by josgarithmetic(39623) About Me  (Show Source):
You can put this solution on YOUR website!
What base? Assuming base 10, or any base, log%2810%2C+10%29=1, because 10%5E1=10.

Assuming any base, b:
1-2%2Alog%28b%2C7x%29=log%28b%2Cb%29-2%2Alog%28b%2C7x%29
=log%28b%2Cb%29-log%28b%2C%287x%29%5E2%29
=highlight%28log%28b%2C%28%28b%29%2F%287x%29%5E2%29%29%29