Vertex form uses the following formula:
[tex] a(x-h)^2 + k [/tex]
a determines the stretch of the parabola. h and k are the x and y values of the vertex (h, k), respectively.
The vertex is at (-1, 0). There is no a value indicated for any answer. Plug these values into the equation:
[tex] \text{h = -1, k = 0} [/tex]
[tex] (x - (-1))^2 + 0 [/tex]
[tex] \boxed{(x+1)^2} [/tex]
The answer is (x+1)^2.
