Urgent calculus help

Question

I need help finding some contour lines for the following function:

Answer 1

h(x,y) = (x² + 6x + 9) + (y² - 4y + 4) = (x + 3)² + (y - 2)²

If h(x,y) = 0, we get the point (-3, 2, 0)

if h(x,y) = 1, we have (x + 3)² + (y - 2)² = 1 (circle lying in the plane z = 1 with center (-3,2,1), radius 1)

if h(x,y) = 4 we have (x + 3)² + (y - 2)² = 4 (circle lying in the plane z = 4 with center (-3, 2, 4), radius 2)