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.