a)x∈N x ≤4
⇒A={1,2,3,4}
b)y ∈N
y=2x+1
x=1 y=3
x=2 y=5
x=3 y=7
x=4 y=9
deci B={3,5,7,9}
c)z=2^x
x=1 z=2
x=2 z=4
x=3 z=8
x=4 z=16
C={1,2,4,8,16}
d)t=x^3
x=1 t=1
x=2 t=9
x=3 t=27
x=4 t=81
D={1,3,9,27,81}
e)u=3x-1
x=1 u=2
x=2 u=5
x=3 u=9
x=4 u=11
E={2,5,9,11}
f)v=x^2-1
x=1 v=0
x=2 v=3
x=3 v=8
x=4 v=15
F={0,3,8,15}
g) w=2x^2+x
x=1 w=3
x=2 w=10
x=3 w=21
x=4 w=36
G={3,10,21,36}
