I have no clue how to do this. I am working on quadratic functions and their graphs in intermediate algebra. This is one question with three parts:

A. Write the function y=3(x-2)^2+6 in the form of Y=ax^2 +bx+c, and find the vertex of the parabola using the formula x=-b/2a

B. Repeat part (a) with the functions y=-4((x-5)^2-9 and y=3(x+2)^2-6.

C. What is the vertex for a parabola that is written in the form y=a(x-h)^2+k?