Tolong di jawab pakai caranya ya please

jawab

x²  + y² - 4x - 2y - 31= 0
(x² - 4x) +(y² -2y) = 31
(x - 2)² + (y -1)² = 31 + 4 + 1
(x - 2)² + (y -1)² = 36
pusat (2, 1), t = 6

4x² + 4y² +8x - 4y -10 =0
x² + y² + 2x - y - 10/4  = 0
(x + 1)² + (y- 1/2) = 10/4 + 1 + 1/4
(x + 1)² +(y -1/2)² = 15/4

pusat ( -1,  1/2) , r = 1/2 √15

2x² + 2y² - 8x + 6y = 20
x² + y² - 4x + 3y = 5
(x² - 4x) + (y² + 3y) = 5
(x - 2)²+ (y +  3/2)² = 5 + 4 + 9/4
(x -2)² + (y+ 3/2)² = 45/4
pusat (2, - 3/2)  r = 3/2  √5