Describe the Level Curves of the Function $f ( x , y ) = x ^ { 2 } + y ^ { 2 } + 3 x - 4 y + 73$

Multiple Choice

Describe the level curves of the function $f ( x , y ) = x ^ { 2 } + y ^ { 2 } + 3 x - 4 y + 73$ .

A) Concentric circles
B) Non-concentric circles
C) Concentric ellipses (not circles)
D) Non-concentric ellipses (not circles)
E) Parabolas with the same vertex
F) Parabolas with the same focus
G) Hyperbolas with the same vertices
H) Hyperbolas with the same foci