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Mathematics 14 Online
OpenStudy (anonymous):

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

OpenStudy (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.

Directrix (directrix):

A. (-2, -3) http://www.wolframalpha.com/input/?i=y+%3D+x%5E2+%2B4x%2B1

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