x2 + y2 - 14x- 15 = 0 (complete the square to write the standard form equation of each circle, identify the center and radius)

Answer 1

x^2-14x+49 + y^2 = 49+15 = 64

(x-7)^2 + (y-0)^2 = 8^2

center (7,0) with radius = 8

Answer 2

x^2 - 14x + y^2 = 15

(x^2 - 14x ) + y^2 = 15

(x^2-14x+49) + y^2 = 15

(x-7)^2 + y^2 = 15

(7,0) is the center

radius is sqrt(15)