Question

Determine as coordenadas do centro das circunferências. a) x2+y2−8y+2x−3=0. b) x2+y2+6y-1=0. c) x2+y2-5x-2=0. d) 4 x2 + 4y2 + 12 x -16=0

Answer 1

a) a=2x/-2x = -1......b=-8y/-2y=4 => C(-1, 4)
b) a=0/-2x=0........b= 6y/-2y=-3 => C(0, -3)
c) a=-5x/-2x=5/2..b=0/-2y= 0 =>C(5/2, 0)
d) a= 12x/-2x= -6...,b= 0/-2y= 0 => C(-6,0)