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
3x2 + x + 3y2 + 3y − 1 = 0
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