Question

Sendo log a 2=20, log a 5=30 calcule log a 100

Answer 1

 log a 100= log a (5x5x4)= log a (5²X2²)= log a 5² + log a 2²= 2(log a 5) + 2(log a 2)= 2( 20) + 2(30) = 40 +60= 100.