5^x +25* 4^-x = 10 What is the value of x?
Pick one:
A) -1	B) -1/2	C) 0	D) 1	E) 1/2
let 5^x = t   t+ 25*1/t =10   t^2 -10t +25 =0   (t-5)^2=0   t-5=0   t=5   5^x=5   x=1   Ans: 1
<result>D</result>
5^x +25* 4^-x = 10 What is the value of x?