Question 63903
Solve for x: e^2x + 4e^-2x = 4. 
LET E^2X =Y
THEN 
E^(-2X)=1/E^2X=1/Y...HENCE
Y+ 4/Y =4
SINCE Y IS NOT ZERO...E^X CAN NOT BE ZERO FOR ANY FINITE X 
Y^2+4=4Y 
Y^2-4Y+4=0
(Y-2)^2=0
Y=2
E^X=2
X=LN(2)
E IS THE ANSWER








X= 
a. (1/2) ln 2
b. (1/3) ln 2
c. (1/3) ln 3
d. (1/2) ln 3
e. ln 2
f. ln 3
g. none of these