Question

If A={1,2},B={x:x belongs to N and x^2-9=o} find A×B

Answer 1

Answer:

A×B = {(1,3),(2,3)}

Step-by-step explanation:

A = {1,2},

B= {x:x€N and x²-9=0} = {3}

A×B = {1,2} × {3}

= {(1,3),(2,3)}

Therefore,

A×B = {(1,3),(2,3)}

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Answer 2

A×B = {(1,2),(3,2),(1,3),(3,3)}

Step-by-step explanation:

Given,

A = {1,2},

B= {x:x€N and x²-9=0}

[x²-9=0

Let x be 1; 1²-9≠0

Let x be 2; 2²-9≠0

Let x be 3; 3²-9=0]

∴B = {3}

A×B = {1,2} × {3}

⇒ {(1,3),(2,3)}

Therefore,

A×B = {(1,2),(3,2),(1,3),(3,3)}