We know the function FX = x Λ 2 + 2x + 4, if X1 + x2 = 0 and X1 = 0

fx1-fx2
=x1^2+2x1+4-(x2^2+2x2+4)
=x1^2-x2^2+2(x1-x2)
=(x1+x2)(x1-x2)+2(x1-x2)
=0+2(x1-x2)
Because x1

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