Question

An equation of a circle is x2 + y2 + 10x + 6y + 18 = 0.

Part 1: Show all your work in determining the center and radius of this circle. (3 points)

Answer 1

(x+5)^2+(y+3)^2=4^2

so centre(-5,-3) radius=4

Answer 2

thank u

Answer 3

(x^2+2.5x+25)+(y^2+2.3x+3^2)+18-25-9=0
(x+5)^2+(y+3)^2=16