Jawabanmu

Jawaban paling cerdas!
2014-09-11T05:03:11+07:00
 3^{x} + 3^{-x} =3 

9^{x} + 9^{-x} =  3^{2x}  + 3^{2x}= (3^x)^{2} +  (3^{-x})^{2}=( 3^{x}+  3^{-x} )^{2}-2. 3^{x}  .3^{-x}     {/tex]\\[tex](3)^2 - 3^{x-x} = 9-1=8
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