In Exercise, use the techniques shown in Example 7 to carry out the following procedures.(...

In Exercise, use the techniques shown in Example 7 to carry out the following procedures.

(a) Find the center and radius of the circle.

(b) Use a graphing utility to graph the circle and to estimate (to two decimal places) the x-intercepts.

(c) Use algebra to find exact values for the x-intercepts, and then use a calculator to check that the results are consistent with the estimates in part (b).

EXAMPLE 7 Completing the square and determining x-intercepts

16x2 − 64x + 16y2 + 48y − 69 = 0