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Point Form of Tangent: Hyperbola

The equation ...

Question

The equation of tangent to the circle $C_{1} : x^{2} + y^{2} - 2 x - 1 = 0$ at the point $(2, 1)$ is?

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Solution

The circle is $x^{2} + y^{2} - 2 x - 1 = 0$
The point is $(2, 1)$
The equation of tangent is $S_{1} = 0 2 x + y - x - 2 - 1 = 0 x + y - 3 = 0$

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