Describe the following sets in Roster form:
{x N: x2< 25}.
First thing analyze the given data. x ϵ N that implies x is a natural number.
x2 < 25
⇒ x < ±5
As x belongs to the natural number that means x < 5.
All numbers less than 5 are 1,2,3,4.
∴ Roster form will be {1,2,3,4}.