Comparing Vertex and Y-intercept of a Quadratic Function

Let the function $f(x) = ax^2 + bx + c$ be a quadratic function, where $a$, $b$, and $c$ are constants. If the vertex of the parabola represented by this function is located at the point $(h, k)$, where $h = -\f\frac{b}{2a}$ and $k = f(h)$, which is the maximum or minimum value of the function depending on the sign of $a$.

Additionally, you know that $a = 2$, $b = -8$, and $c = 6$. Calculate the values for $h$ and $k$. Based on this information, consider the following quantities:

Quantity A: The vertex $(h, k)$

Quantity B: The y-intercept of the function, which is $f(0)$.