Answer:
The y-intercept will always be the vertex of the function.
Step-by-step explanation:
The functions with the following form [tex]f(x) = ax^2 + bx + c[/tex] are quadratic equations and have a parabolic form, which means the have a vertex. The x coordinate of the vertex is given by the following expression [tex]x = \frac{-b}{2*a}[/tex]. When b is equal to zero, the vertex of the function will always be the y-intercept, therefore the correct answer is the third one.
