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Take the derivative: y' = 2x + 4. Set equal to zero: 2x + 4 = 0 --> x = -2. Substitute into original and y = -3.

Axis of symmetry is x = -2. Vertex is (-2,-3)

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Q: What is the vertex and the axis of symmetry for the function y equals x2 plus 4x plus 1?
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