Friday, October 16 Write in vertex form by completing the square. 1) y = x 2 + 8x + 3 2) y = x x + 11

Circles

Circle - Set of all points in a plane that are equidistant from a given point called the center (h,k)

Example: Identify the center and radius and graph the circle. a) x 2 + y 2 = 16 Center: ____ Radius: ____

Example: Identify the center and radius and graph the circle. b) (x-3) 2 + (y-5) 2 = 36 Center: ____ Radius: ____

Example: Identify the center and radius. a) x 2 + y 2 + 6x – 7 = 0 Center: ____ Radius: ____

Example: Identify the center and radius. b) x 2 + 2x + y 2 + 4y – 11 = 0 Center: ____ Radius: ____

Example: Identify the center and radius. c) x 2 + y 2 – 6x – 12y + 36 = 0 Center: ____ Radius: ____

Example: Identify the center and radius. d) x 2 + y 2 + 2x + 6y = 26 Center: ____ Radius: ____