7 x² + 7 y² - 28 x + 42 y - 35 = 0 /: 7 x² + y² - 4 x + 6 y - 5 = 0 ( x² - 4 x + 4 ) + ( y² + 6 y + 9 ) - 4 - 9 - 5 = 0 The equation in the standard form is: ( x - 2 )² + ( y + 3 )² = 18 The center is at the point ( 2, - 3 ). Its radius is: √18 = 3√2 units.
