Showcase extra: the real practice and quiz players do not have this button.
Correct answer: (2, 0), (4, 0), (3, -1)
- Read the zeros from the factors: when or , so the -intercepts are and . Watch the signs: the factor gives the intercept .
- Find the axis of symmetry (midpoint of the zeros): The vertex lies halfway between the zeros: .
- Compute the vertex y-value: . The vertex is .
- Determine direction and sketch: Expanding gives with , so the parabola opens upward. Plot , and the vertex .
