October 9, 2015

Homework Help: Alg2

Posted by Allen on Thursday, October 22, 2009 at 11:17pm.

The tangent to a circle may be defined as the line that intersects the circle in a single point, called the point of tangency. If the equation of the circle is x^2 + y^2 = r^2 and the equation of the tangent line is y = mx + b, show

r^2(1 + m^2) = b^2


The quadratic equation x^2 + (mx + b)^2 = r^2 has exactly one solution.

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