State whether the graph of the function is a parabola If the
     State whether the graph of the function is a parabola. If the graph is a parabola, find the parabola\'s vertex.  f(x) = x^2 + 4x + 3  Select the correct choice below and, if necessary, fill in the answer box to complete your choice.  A. The graph of the function is a parabola. The vertex is (Type an ordered pair.)  B. The graph of the function is not a parabola. 
  
  Solution
Yes, the graph of the given function is parabola.
Vertex of a parabola is the highest or lowest point in parabola.
y = (ax^2 + bx + c)
transform above equation in this form
y = a*(x - h)^2 + k
where (h, k) = vertex of parabola
givenequation is
y = x^2 + 4x + 3
y = (x^2 + 4x + 4) - 1
y = (x + 2)^2 - 1
h = -2, k = -1
vertex = (-2, -1)

