Jawabanmu

2014-07-25T11:02:19+07:00
 3^{x}=a  ,    3^{-x}=b
   a.b= 3^{x} . \frac{1}{ 3^{x}} =1
jadi
a²+b²=14
(a+b)²-2ab=14
(a+b)²=14+2
a+b=4...................jwaban (a)
a+1+b+1=4+2=6......jwaban (b)
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