## anonymous 4 years ago Which point is the vertex of the parabola y = x2+4x+1? A. (-2, -3) B. (2, 3) C. (-2, 3) D. (2, -3)

1. anonymous

If we have$y = ax^2 + bx + c$Then the x-coordinate of the vertex can be found from $x = -{b \over 2a}$Then we substitute this into the function to get the y-coordinate.

2. Directrix

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