In the equation x2+y2+Dx+Ey+F=O,D,E, and F are ______numbers.
a.negative
b.real
c.positive
d.zero

Answer:
B. Real
Step-by-step explanation:
Real numbers are composed of the other choices (negative, positive, zero - also called integers), fractions, decimals, rational numbers, irrational numbers, and the like.
The equation in question is the general equation of a circle, right? Correct me if I'm wrong.