According to the text of the question
Compare the co-efficients and solve the system of equations for p and q:
You should come out with p = -4 and q = 2 (the negative solution of q is not allowed).
Thus the quadratic function has the equation:
to b): Determine the vertex of the parabola by completing the square.
to c) Determine the zeros of the function and consequently those intervals where y < 0.