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