For all functions of the form f(x) = ax^2 + bx + c, which is true when b=0

The y-intercept will always be the vertex of the function.

Step-by-step explanation:

The functions with the following form 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 . 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.

the answer is d

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