Question

a)Log 243
3
b) Log 625
5

Answer 1

a) log 243 = x    $3^{x} = 243$          
      3

iguala-se as bases

$3^{x} = 3^{5}$

x = 5

b)  log 625 = x
       5

$5^{x} = 625$

$5^{x} = 5^{4}$

x = 4