Hi Tren 301,
I am very happy to answer your question. I get to practice writing in Latex so we both win.
Find the equation of the quadratic function with; axis of symmetry x=2, maximum value -1 and point (4, -8) .
The vertex is (2,-1)
I am assuming that this is a standard parabola, not a sideways one so the formula will be
And now the answer is in the form that you wanted.