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Show that the equation x² + y² - 6y + 2 = 0 represents a circle and find the center and radius.

A. Circle; center (3, -3), radius 1
B. Circle; center (-3, 3), radius 2
C. Circle; center (3, 3), radius 2
D. Circle; center (-3, -3), radius 1

User Yamini
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1 Answer

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Final answer:

The equation represents a circle with center (0,3) and radius √7, thus none of the given options are correct.

Step-by-step explanation:

To show that the equation x² + y² - 6y + 2 = 0 represents a circle, we need to complete the square for the y-terms. First, we rewrite the equation as:

x² + (y² - 6y) = -2.

Next, we add ³9 to both sides to complete the square, which gives us:

x² + (y - 3)² = -2 + 9,

which simplifies to:

x² + (y - 3)² = 7.

This equation is in the standard form for a circle (x - h)² + (y - k)² = r², where (h, k) is the center of the circle and r is the radius. Comparing this to our equation, the center of the circle is (0,3) and the radius is √7.

Therefore, the given options are all incorrect as the correct center and radius are not listed among them.

User Jim Carroll
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