A. Identify whether the graph of each quadratic function opens upward or downward.

1. f(x) = 3x² - 1
2. f(x) = x² + 3
3. f(x) = 2x² + 1
4. f(x) = -x² + 3
5. f(x) = -x² + 5

B. Graph each quadratic function.
1. f(x) = x² + 1
2. f(x) = x² - 5
3. f(x) = -x² + 1
4. f(x) = -x² + 5
5. f(x) = x² + 6​