Let's say we have a vertex of the parabola $V(2,6)$ and a point where it passes through $(-1, 4)$. It follows that $h=2$ and $k=6$ and the point where it passes through is a solution of the equation that is $x=-1$ and $y=4$. By substituting the value to the vertex form of the parabola equation we can easily get its equation. But when I try to use the conics form of the parabola equation, I became confused especially in the $4p$ part of the equation: $(x-h)^2=4p(y-k)$
When solving this type of problems do I need to use the vertex form of the parabola equation?