Question

qual o valor do logaritmo:

log 25 de base 1/5?

Answer 1

$log( \frac{1}{5} ) ^{25} =x$

$( \frac{1}{5} )^x =5^2$

$(5^{-1} )^x =5^2$

$5 ^{-x} =5^2$

$-x=2$  (-1)

$x=-2$