Respostas

2014-05-22T12:00:48-03:00
2014-05-22T12:13:02-03:00
16^x=28 =>
(2^4)^x=(2.2.7)
2^4x=2².7
Aplicando logaritmo:
Log 2^4x=Log(2².Log7)
Log 2^4x=Log 2²+Log7
Utilizando as propriedades:
4x.Log 2=2.Log 2 + Log 7
4x.0,30=2.0,30+0,85
1,20x=0,60+0,85
1,20x=1,45
x=1.45/1,20
x=1,20 aproximadamente
16^1,20=27,857618025475972452360640559352