### Home > PC > Chapter 7 > Lesson 7.2.4 > Problem 7-81

7-81.

Regroup with *x*'s and *y*'s together and the constant on the other side.

(*x*^{2} − 10*x* + ?) + (*y*^{2} + 8*y* + ?) = − 5

Complete the square finding the ?'s and adding the same amount on both sides.

(*x*^{2} − 10*x* + 25) + (*y*^{2} + 8*y* + 16) = − 5 + 25 + 16

Simplify and graph.

(*x* − 5)^{2} + (*y* + 4)^{2} = 36

Follow the same thinking process as (a) above.