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.