(2^x)^2 = 2^2
2x= 2
x= 1
notezi pe 2^x = t
t^2 -5t+4=0
delta = 25-16= 9
t1= (5+3)/2 = 8/2 = 4
t2 = (5-3)/2 = 2/2 = 1
din t1 = 2^x, 2^x= 4, 2^x = 2^2, x=2
t2 = 2^x, 2^x = 1, 2^x = 2^0, x=0
S={0,2}
notezi log2 (x) = t
t^2 -3t+2 <0
delta = 9-8 =1
t1 = (3+1)/2 = 4/2 = 2
t2 = (3-1)/2 = 2/2= 1
din t1 = log2 (x), log2 (x) = 2, x= 2^2 = 4
din t2 = log2 (x), log2 (x) = 1, x=2^1 = 2
S={2,4}
