Respuesta :
x²-18x+81 + y²+8y+16 = -5+81+16=92
(x-9)² + (y+4)² = (2✓23)²
circle centered at (9,-4) with radius 2✓23
(x-9)² + (y+4)² = (2✓23)²
circle centered at (9,-4) with radius 2✓23