I was wanting some help with this one please. It's a word problem for which I have to figure out the quadratic equation. I have the answer but am insure how to arrive at it. The answer id y= -1.75(x-2)^2 -1

Find the equation of the quadratic function with; axis of symmetry x=2, maximum value -1 and point (4, -8) .

So my thinking is to use the Turning Point references into a Vertex form function and use the x,y point reference to solve. But I'm not well practiced and I got stuck.

Could someone show me the working on this one please?