Identify and sketch the graph of the following equations, write each step

to get the graph:

a$.2x^2+2y^2+2z^2+8x-12z+1=0$

b$.2y^2+2z^2-x^2=0.$

c$.2y^2-x^2+2z^2=8$

d$.x-y^2-4z^2=0$