Question

O valor da base x de

log, 81 =2

é:
a) 8
b) 9
c) -8
d) -9
e) 3​

Answer 1

logc a = b, então c^b = a

logx 81 = 2

x^2 = 81

x^2 = 9^2

x = 9

Resposta: x = 9