Question

How do you calculate `log_8 7.9` with a calculator?

Answer 1

`log_8 7.9=0.9939`

Explanation:

Let `log_ba=x`. Hence `b^x=a` and log (to the base `10`) on both sides, we get

`xlogb=loga` or `x=loga/logb`

Hence `log_ba=loga/logb` and

`log_8 7.9=log7.9/log8`

= `0.8976/0.9031`

= `0.9939`