Find equations of both lines through the point (2,-3) that are tangent to the parabola . I know the derivative of the parabola: , but I am not sure how to use that to find the two lines.
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The trick with this is they don't tell you where it's tangent. Use Where Then solve for x. You will get two solutions. Those are the x-coordinates of your tangency points.
Last edited by galactus; Nov 24th 2008 at 06:38 AM.
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