Thread: urgent help please

find the radius and center of

Originally Posted by ea12345

find the radius and center of

The general equation of a circle of radius r and centre at (h, k) is .

actual equation is

Originally Posted by ea12345

actual equation is

Complete the square:

.

Now read again my first post.

x2 + y2 + 8x + 8 = 0
x2 + 8x + (4)2 + (y – 0)2 = -8 + x2
(x + 4)2 + (y – 0)2 = 8
(x – (-4) )2 +(y – 0)2 =( )
(x –(-x) )2 + (y – 0) = (2 )
SO, centre is (-4 , 0) and radius is 2





its true or not ?

Originally Posted by ea12345

x2 + y2 + 8x + 8 = 0
x2 + 8x + (4)2 + (y – 0)2 = -8 + x2
(x + 4)2 + (y – 0)2 = 8
(x – (-4) )2 +(y – 0)2 =( )
(x –(-x) )2 + (y – 0) = (2 )
SO, centre is (-4 , 0) and radius is 2





its true or not ?

The radius is not 2.

then