Question

Write the following in roster form :-
1) {x:x²- 9=0, x€Z}
2) {x:x€Z and x²<20}
Note:- €- belongs to ​

Answer 1

Answer:

answer for the given problem is given

Answer 2

ANSWER:

The roaster form is \{-3,3\}{−3,3} .

Step-by-step explanation:

To find : Write the following in roster form { x:x is and integer x²-9=0} ?

Solution :

Roster form of a set is a list of elements that are in the set.

The set we have given is

S=\{ x:x \text{ is and integer } x^2-9=0\}S={x:x is and integer x

2

−9=0}

Now to get elements we solve the equation,

x^2-9=0x

2

−9=0

x^2=9x

2

=9

x=\pm\sqrt{9}x=±

9

x=\pm 3x=±3

The roaster form is \{-3,3\}{−3,3} .