SOLUTION: The vertex of this parabola is at (-1, -3). Which of the equations below could be its equation?

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Question 302773: The vertex of this parabola is at (-1, -3). Which of the equations below could be its equation?

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use the vertex form of a parabola.
y=a%28x-h%29%5E2%2Bk, where the vertex is (h,k).
y=a%28x%2B1%29%5E2%2B3 or expanded,
y=a%28x%5E2%2B2x%2B1%29%2B3
y=ax%5E2%2B2ax%2B%28a%2B3%29