# Logarithms!!

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• January 27th 2009, 06:44 PM
peepsrock09
Logarithms!!
Yay. (Wink)

will someone please explain to me why log[sub]2 4 - log[sub]2 16 = -2??

thanks
• January 27th 2009, 08:16 PM
becker89
well its pretty basic,
you just need to ask yourself the right questions:
what number that 2 raised to,gives you 4?
and second question is what number that 2 is raised to,gives you 16?
• January 27th 2009, 08:19 PM
mr fantastic
Quote:

Originally Posted by peepsrock09
Yay. (Wink)

will someone please explain to me why log[sub]2 4 - log[sub]2 16 = -2??

thanks

$\log_2 4 - \log_2 16 = log_2 2^2 - \log_2 2^4 = 2 - 4 = -2$.