Where is the center of the circle and what is its radius

(3, -4) and r = 3

Step-by-step explanation:

The center of a circle can be found using the equation and is (h,k) from it. Notice h and k are the opposite value as in the equation.  

First write the equation in this form.  

Complete the square with each variable to find what numbers should go in place of the question marks.  

Since 16 has already been added to the equation, just add 9 to both sides of the equation.  

So the center is (3,-4) and the radius is 3.

answer: 414,377,008

step-by-step explanation:

just multiply it