What is the radius of the circle whose equation is x^2 + y^2 = 8?

2√2

Step-by-step explanation:

To write the equation of a circle, use the formula where the center of the circle is (h, k).

This means the equation is has . This means the radius is √8 = 2√2.

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square