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January 25, 2015

January 25, 2015

Posted by **molly** on Wednesday, November 30, 2011 at 11:04pm.

- algebra -
**Steve**, Thursday, December 1, 2011 at 5:17am15^(log

_{15}n) = n

That's the definition of the logarithm. It's the power of the base needed to get the number.

So, 15^log9 = 9 (using base 15)

15^2log9 = (15^log9)^2 = 9^2 = 81

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