Decide among the following sets, which are subsets of which:
A = {x:x satisfies x2 – 8x + 12=0}
B= {2,4,6}
C= {2,4,6,8,….}
D={6}
A = x2 – 8x + 12=0
= (x–6)(x–2) =0
= x=2 or x=6
B ={2,4,6}
C= {2,4,6,8}
D ={6}
So we can say
D⊂A⊂B⊂C