Log915+ log918- log910

Question

Log915+ log918- log910

Answer 1

Log9 (15) + log9(18) - log9(10) = 
= log9 (15*18) - log9(10) = 
= log9 (270) - log9(10) = 
= log9 (270/10) = 
= log9 (27) =
= log3^2(3^3)  =
= 1/2*log3(3^3) = 
= 1/2*3 = 1,5