Question

Como calcular log de 0.2na base 25

Answer 1

veja

$\log_{25} 0,2=x$

$25^x=0,2$

$25^x= \frac{2}{10}$

$25^x= \frac{1}{5}$

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

$2x=-1$

$x=- \frac{1}{2}$