Question

The roaster form of set A={ x : x2 +x-2=0 and x is a real number}​

Answer 1

Given x

2

+x−2=0

x

2

+2x−x−2=0

(x+2)(x−1)=0

when x+2=0 then x=−2

when x−1=0 then x=1

Hence, roster form of equation is {−2,1} or {1,−2}

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