Question

What is the center of the circle with the equation x2 + y2= 9?
Wouldn't it be (3,3) or (0,9)? :/

Answer 1

the general form is

\[(x - h)^2 + (y - k)^2 = r^2\]

(h, k) is the centre and r is the radius...

so match this to your equation.

Answer 2

I'm sorry I don't understand I'm new at this but how would I plug x2 and y2 to that?

Answer 3

x^2 + y^2 is always a circle with a centre at the origin.

9 is the square of the radius.... so the radius is 3

Answer 4

so (0,3)?? -_-