If log_2 (ax^2 + x + a) ≥ 1∀ x∈R, then exhaustive set of value

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ax^2 + x + a ≥ 2, ∀ x∈R
ax^2 + x + a - 2 ≥ 0, ∀ x∈R
a > 0, D ≤ 0

Source: Grass-G / M-18 Mathematics Paper 27 Nov Third.docx

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