Question

Help..Find the center and radius:
2x^2 + 2y^2 + 8x + 7 = 0

Answer 1

center (4, 0 )

Answer 2

radius is 3

Answer 3

are you sure ? maybe im too tired but i get this :

x^2 + y^2 + 4x = -3.5
x^2 + 4x + 4 - 4 + y^2 = -3.5
(x+2)^2 + y^2 = -3.5 + 4
(x+2)^2 + y^2 = 0.5

center -2,0
radius (0.5)^0.5 = 1/(2^0.5)

Answer 4

hmm are you sure ?

Answer 5

my bad i didn't realize co efficient of x and y are also there

Answer 6

i might be wrong but i dont see any mistake

Answer 7

no you are right my mistake i should have divided it by 2 first

Answer 8

sorry precalc

Answer 9

Wow

Answer 10

coolsector is right

Answer 11

thank you both :)

Answer 12

Well, at least it's solved

Answer 13

Cool Sector, very good work