Question

ma poate ajuta cineva?
$a) \: log_{3} \: 81 =$
$b) \: log_{5} \sqrt{ 125} =$
$c) \: log \sqrt{ \frac{1}{100} } =$

Answer 1

$a) log_{3}(81) = 4$

${3}^{4} = 81$

$b) log_{5}( \sqrt{125} ) = log_{5}( {5}^{3} ) = 3$

${5}^{3} = \sqrt{125}$

$c) lg( \sqrt{ \frac{1}{100} } ) = lg( \frac{ \sqrt{1} }{ \sqrt{100} } ) = lg( \frac{1}{10} ) = lg( {10}^{ - 1} ) = - 1$