A certain circle can be represented by the following equation. x2 + y2 + 10x + 12y + 25 = 0. What is the center of this circle? What is the radius of this circle? Please help!

Let's try to complete the squares.

The x-part starts with , which is the beginning of . So, we'll think of as

Similarly, we have that

So, the equation becomes

Now we have writte the equation of the circle in the form

When the equation is in this form, everything is more simple: the center is and the radius is .

72 is the answer to this problem

1. 8

2. 9

3. 20

4. 3

5. 17

6. 2.2

7. 11.25

8. 1

9. 14

10. 2

step-by-step explanation:

thats the first half