Factor completely: 3x3 – 48x
a. x(x – 4)(x – 4)
b. 3(x + 4)(x – 4)
c. 3x(x – 16)
d. 3x(x + 4)(x – 4)

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32