A set a = {X & sup2; - 3x + 4 = 0, X ∈ r}, B = {x | (x + 1) (X & sup2; + 3x-4) = 0, X ∈ r}, and a proper subset P subset B | Math enthusiast | Mathematical art

A set a = {X & sup2; - 3x + 4 = 0, X ∈ r}, B = {x | (x + 1) (X & sup2; + 3x-4) = 0, X ∈ r}, and a proper subset P subset B

A={x|x²-3x+4=0}=Φ
B={x|(x+1)(x+4)(x-1)=0}={-4,-1,1}
There are seven possibilities for P
P={-4},P={-1},P={1}
P={-4,-1},P={-4,1},P={-1,1}
P={-4,-1,1}

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