How many x-intercepts (in maximum) does each function could have?
a quadratic function with a y-intercept of 0 and an axis of symmetry
a quadratic function with a vertex at (3, 1), passing through the point (1, -3)
A quadratic function with an axis of symmetry of x = 0 and a maximum value of 8.
a quadratic function with a range of y ≥ 1
