Question

The center of the circle is (2a-1 ,7) and it passes through the point (-3,-1) if the diameter of the circle is 20 . Find the value of a

Answer 1

hope this helps you....

Answer 2

$(2a - 1 \: . \: 7) \: and \: ( - 3 \: . \: - 1) \\ = > ( {4(a + 1)}^{2} ) + 64) = 100 \\ = > 4 {(a + 1)}^{2} = 36 \\ = > {(a + 1)}^{2} = {3}^{2} \\ = > a = - 4 \\ = > a = 2$
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