Problem

Decide whether or not equation has a circle as its graph. If it does, give the center and...

Decide whether or not equation has a circle as its graph. If it does, give the center and the radius. If it does not, describe the graph. See Examples 1–2.

EXAMPLE 1

FINDING THE CENTER AND RADIUS BY COMPLETING THE SQUARE

Example 2

DETERMINING WHETHER A GRAPH IS A POINT OR NONEXISTENT

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Solutions For Problems in Chapter 2.2

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