Log5 8 + log5 10 - 2log5 20

Answer 1

Using logarithmic laws, we can simplify the expression as:

log5 (8*10/20^2)

= log5 (80/400)

= log5 (1/5)

= log5 5^-1

= -1

Therefore, log5 8 + log5 10 - 2log5 20 = -1.