Mathematics, 18.03.2021 01:20 ReaLily

The equation of a circle is x2 + y2 + 8x – 2y =1. (i) State the coordinbites of its centre and find the exact length of its radius.
(ii) Prove that the point P(-7,4) lies on its circumference.
(iii) Given that PQ is a diameter, determine the coordinates of Q.
(iv) Find the equation of the tangent at the point Q.

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