Find an equation for the sphere with the given center and radius. Center (0, -3, -6), radius = 9 HINT: First write the equation of sphere the way we learned in class. Then multiply out. x2 + y2 + z2 + 6y + 12z = 36 x2 + y2 + 9z2 + 6y + 12z = 36 x2 + y2 + z2 + 6y - 12z = 36 x2 + y2 + 9z2 + 6y - 12z = 36

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Q: determine the radius and the coordinates of the center of the circle which equation x2+y2-4x+8y+3=0

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