2^x +2* 2^-x = 4 What is the value of x?	Select:
A) -1	B) -1/2	C) 1	D) 1/2	E) 0
let 2^x = t   t+1/t =2   t^2 -4t +4 =0   (t-2)^2=0   t-2=0   t=2   2^x=2   x=1   Ans: 1
<result>C</result>
2^x +2* 2^-x = 4 What is the value of x?