Respostas

2013-12-04T11:48:04-02:00
A) log(a) 81 = 4
log(a) 3^4 = 4
4 log(a) 3 = 4
log(a) 3 = 4/4
log(a) 3 = 1
a^1 = 3
a = 3

b) log(a)4 = -2
a^-2 = 4
a^-2 = 2²
(a^2)^-1 = 2²
(a^-1)^2 = 2²
a^-1 = 2
1/a = 2
2a = 1
a = 1/2

c) log(a)5 = 1
a^1 = 5
a = 5

4 4 4