Posted by **yuia** on Monday, February 25, 2013 at 11:43pm.

tangents are drawn from the point (-4,0) to the circle x^2 +y^2 =1. find the slopes of the tangent.

- pre-calculus -
**Steve**, Tuesday, February 26, 2013 at 12:39am
If the tangent hits the circle at (h,k)

it has length

L^2 + 1 = 16

L = sqrt(15)

h^2 + k^2 = 1

(4+h)^2 + k^2 = 15

Solve for h,k, and the slope is

k/(4+h)

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