Question

Log de 625 na base 1/5 - log de 25 na base 1/5

Answer 1

625=(1/5)^n 》 5^4=5^-1n n=-4
5^2=5^-n n=-2

Answer 2

(1/5)^ x = 625 5^-x = 5^4 ∴ -x = 4 ∴ x = -4 (1/5)^ x = 5^2 ∴ 5^ -x = 5^ 2 ∴ x = - 2 -4 + 2 = -2