Saved Bookmarks
| 1. |
Find the centre and radius of the circle x2 + y2 + 8x + 10y – 8 = 0 |
|
Answer» x2 + y2 + 8x + 10y – 8 = 0 ⇒ (x2 + 2.x.4 + 16) - 16 + (y2 + 2.y.5 + 25) – 25 – 8 = 0 ⇒ (x + 4)2 + (y + 5)2 = 49 ⇒ centre = (-4, -5), radius = 7 |
|