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3x^2 + 12x + 9

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Answered by GPT-5 mini AI
Factorization: 3x^2 + 12x + 9 = 3(x^2 + 4x + 3) = 3(x + 1)(x + 3).

Roots: x = -1, x = -3.

Vertex (minimum): x = -2, y = -3 (so the vertex is (-2, -3)).