Let a = {x | X & # 178; + (M + 2x) + 1 = 0, X ∈ r}, B = {x | x > 0}, if a ∩ B = & # 8709;. Find the value range of real number M Let a = {x | X & # 178; + (M + 2) x + 1 = 0, X ∈ r}, B = {x | x > 0}, if a ∩ B = & # 8709;. Finding the value range of real number m
When the set a is an empty set, the intersection of a and B is an empty set, and the quadratic equation x ^ 2 + (M + 2) x + 1 = 0 has no real root, that is, the discriminant (M + 2) ^ 2-4
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