How do you calculate log_5 (-28) with a calculator?
1 Answer
See explanation.
Explanation:
The given logarythm cannot be calculated because
To do this we have to use the Change of Base Formula, which is:
log_ax=log_bx/log_ba
This formula lets us change the logarythm with non standard base to a quotient of logarythms of any other base.
Calculators don't have logarythm of base
The procedure is:
-
Press
5 andlog to calculatelog5 . -
Press
M to put the result in memory. -
Press
28 andlog to displaylog28 -
Press
-: (division) button -
Press
RM to recall the result stored in pt. 2. -
Press
= to calculate the final result.