Question

Solve log10+log15-2log5

Answer 1

hi friends

 log10 + log 15- 2 log 5=
0.77815125038 

thank you 

Answer 2

Hello dear

use the property of logab = loga + logb ----------1

we know that log 10 = 1
and write log 15 as log3×5 => log5 + log3

=> 1 + log5 + log3 - 2log5
=> 1 + log5 ( 1 -2) + log3
=> 1 - log5 +log3
=> 1+log3-log5
we can write log5 as log(10/2)
=> log5 =. log10 - log2

now log3 = 0.414 and log2 = 0.301

so plug the values

=> 1 + 0.477 -1 + 0.301
=> 0.778