Question

if A={1, 4}and B={x:x belongs to natural number, x^2-4=0}find a cross b​

Answer 1

given :

A = {1,4}

B = {x: x £N , x^2-4=0}

x^2-4=0

=) x^2 = 4

=) x = 2

(WKT Sq.root of 4= +2,-2;

but -2 have to be neglected,

coz -2 is not a natural number)

therefore, B = { 2 }

A × B = { 1,4 } × { 2 }

A × B = { (1,2), (4,2)}