3^x + 9*3^-x = 6 What is the value of x?
Select the correct option
A) -1 B) 1 C) 0 D) 1/2 E) -1/2
let 3^x = t   t+9/t =6   t^2 -6t +9 =0   (t-3)^2=0   t-3=0   t=3   3^x=3   x=1   Ans: 1
<result>B</result>
3^x + 9*3^-x = 6 What is the value of x?