Never complete the square again
Desmos draws equations, not just functions — so type the whole circle.
1:59 · Circles
Worked in this video
x² + y² − 6x + 8y − 11 = 0
What is the radius of the circle?
Type it exactly as written, y² included. Desmos draws every point that fits, so the circle appears. The centre sits at (3, −4) and it runs from −3 to 9 across: diameter 12, radius 6. Nothing was completed.
Answer: Radius 6