In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
x² - 18x + y² - 8y - 8 = 0
circle standard form = ?
Step 02:
x² - 18x + y² - 8y - 8 = 0
x:
y:
x² - 18x + 81 + y² - 8y + 16 = 8 + 81 + 16
(x - 9)² + (y - 4)² = 105
The answer is:
(x - 9)² + (y - 4)² = 105