1.

Let (5,6) and (9,−4) be two points on a parabola . The point of intersection of tangents at these points is (1,−2). Then the slope of directrix of the parabola is

Answer»

Let (5,6) and (9,4) be two points on a parabola . The point of intersection of tangents at these points is (1,2). Then the slope of directrix of the parabola is



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