Question

Solve the inequality 2x2 +4x ≥ 6.

[a] x ∈ (−∞,1]

[b] x ∈ (−∞,−3] or x ∈ [1,+∞)

[c] x ∈ [−3,1]

[d] x ∈ (−∞,1] or x ∈ [−3,+∞)

 

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