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11. The equation of a circle is 3x² + 18x + 3y²-24y-72-0. Find the coordinates of the centre of the circle and its radius. (4mks)​
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11. The equation of a circle is 3x² + 18x + 3y²-24y-72-0. Find the coordinates of the centre of the circle and its radius. (4mks)​

User Epifanio
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User Viatcheslav Ehrmann
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