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if A ={1,2} B={x:x€N and x^2-9=0} find A×B.
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Manbar Singh answered this

in Math, Class

We have,A = {1, 2}B = {x : x∈N and x2 − 9 = 0}Now, x2 − 9 = 0⇒(x − 3)(x + 3) = 0⇒x − 3 = 0   or  x + 3 = 0⇒x = 3  or  x = −3So, B = {3}Now, A×B = {1, 2} × {3} = {(1, 3);(2, 3)}

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Kalyani Jha answered this

37 unhelpful votes in Math, Class XI-Science

{1,2,3,5,7,8}

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