1.The equation of a circle in general form is x2 + y2 – 6x + 4y – 86 = 0 What is the center and radius of the circle?

1 answer
Question:

1.The equation of a circle in general form is x2 + y2 – 6x + 4y – 86 = 0 What is the center and radius of the circle?

Answers

x² - 6x       + y² + 4y     = 86  Complete the square:x² - 6x + (9)  +  y²+4y + (4) = 86 + (9) + (4)→(x - 3)² + (y + 2)² = 99Center: (3, -2)radius: √99 = 3√11

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