2: Use h = 1, k = 2, and any value of a.
3: Subtracting from x moves a graph to the right, and adding to the expression moves the graph upward.
31: The vertex is the point (h, k), and the axis of symmetry is the line x = h.
35: Identify the vertex and the direction of the parabola.
37: How is this different from #36?
42: Identify the vertex, and sketch the parabola downward from there since the leading coefficient is negative.