3.3

1: How can you tell if the parabola opens upward or downward?

5: See the first slide for an illustration of each of these.

7: Calculate h ＝ -b divided by 2a, and then plug this value in as x to find k.

12: 2 times -3/4 is -6/4, and dividing by this is the same as multiplying by -4/6.

19: b is -12, not 12.

21: k is the minimum value if the parabola opens upward or the maximum value if the parabola opens downward.

31: Parabolas are symmetrical, so if you move the same distance to the right or to the left of the vertex, the new y value will be the same either way.

44: -b/2a is h, the x-coordinate of the vertex.