For all functions of the form f(x) = ax2 + bx + c, which is true when b = 0?

the graph will always have zero x-intercepts.

the function will always have a minimum.

the y-intercept will always be the vertex.

the axis of symmetry will always be positive

C. The y-intercept will always be the vertex.

Step-by-step explanation:

For the quadratic function, , the coordinates of vertex will be,

If , then the coordinates of vertex will be,

(∵ )

This is the coordinate of the y-intercept, because at y-intercept the x coordinate is 0.

the one below it is a function