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Find the centre and radius of the following circles : x^2 + y^2 + 6x -4y -12 = 0 |
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Answer» Solution :`x^2 + y^2 + 6X -4y -12 = 0` `therefore` 2g = 6, 2F = -4, c = -12 `therefore` g = 3, f = -2 `therefore` CENTRE of (-g, -f) = (-3, 2) and radius = `sqrt(g^2 + f^2 -c)` = `sqrt(9 + 4 + 12)` = 5 |
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