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ruthd113
10.03.2021 •
Mathematics
Find the value of A please. Timed!!
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Ответ:
A circle is a set of points in a plane equidistant from a fixed point. It has a general formula of x² + y² = r². This is if the center is at the origin. However, if the center at point h and k, the equation becomes (x-h)² + (y-k)² = r².
x² + y² + 10x – 6y + 18 = 0We write the given equation in the form (x-h)² + (y-k)² = r² by completing the square.
(x² + 10x + 25 )+ (y² - 6y + 9) = −18 + 25 + 9 = 16
(x + 5)² + (y + 3)² = (4)²
Therefore,
center = (-5, -5)
radius = 4