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Question

The roster form of the set {x:x is a real number and x3=3x22x}

A
{1,2}
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B
{0,1,2}
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C
{1,2,ϕ}
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D
{0,ϕ,1,2,3}
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Solution

The correct option is B {0,1,2}
x3=3x22x
x33x2+2x=0
x(x1)(x2)=0x={0,1,2}

Roster form ={0,1,2}

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