If P(a, a 2 ) is any point on the parabola y = x 2 , except
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If P(a, a2) is any point on the parabola y = x2, except for the origin, let Q be the point where the normal line at P intersects the parabola again (see the figure).
(a) Show that the y-coordinate of Q is smallest when a = 1/√2.
(b) Show that the line segment PQ has the shortest possible length when a = 1√2 .
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a b 1 yx y 2x so the slope of the tangent line at Pa a is 2a and the ...View the full answer
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