Answer
Part A:
a = any real number and b = 0
Part B:
a = 0 and b = any real number
Work Step by Step
Part A: One graph that is symmetric about the y axis is a parabola. A parabola can be achieved from the formula by making a = any real number and b = 0.
Part B: One graph that is symmetric about the origin is a cubic graph. A cubic graph can be achieved from the formula by making a = 0 and b = any real number.