Salve for X
5x = 90
x = 18
x2 - 2x - 8
(x-4) (x+2)
The radius of a circle whose equation is (x-4)2 + (y-2)2 = 36.
240 = 6x
x = 40
5x2 + 14x - 3
(5x-1) (x+3)
Find the center
(x-5)2 + (y+3)2 = 196
(5,-3)
18x = 54
x = 3
4x2 - 25
(2x+5) (2x-5)
Circle that has a center of (3,-2) and a radius of 11.
(x-3)2 + (y+2)2 = 121