For the graph of the function below, identify the axis of symmetry, vertex and the formula for the function.

a. axis of symmetry: x = –1; vertex: (–1, 0); f(x) = –x2 – x + 2

b. axis of symmetry: x = –1; vertex: (–1, 0); f(x) = –2x2 – 2x – 1

c. axis of symmetry: x = –1; vertex: (–1, 0); f(x) = –x2 – 2x – 1

d. axis of symmetry: x = –1; vertex: (–1, –1); f(x) = –x2 – 2x – 1