1 point 18. the center of sphere (x + 1)x + 3) + y-2(y-4) + (7+ 1)(z + 3) = 0 is (b) (1,-1,1) (d) (-2,3,-2) (a) (-1.1.-1) (c)(2,-3,2) o a ob o c od 9.* 1 point

1 point 18. The center of sphere (x + 1)x + 3) + y-2(y-4) + (7+ 1)(z + 3) = 0 is (b) (1,-1,1) (d) (-2,3,-2) (a) (-1.1.-1) (C)(2,-3,2) O a Ob O C Od 9.* 1 point Angle between the planes 2x + 3y - 5z = 6, 3x + 8y+ 6z = 92 45 D) a) 30 d) )90 (C) 60