Question: For the ellipse in Fig. 21.120, show that the product of the slopes PA and PB is b 2 /a 2 . Fig. 21.120 B(-a,

For the ellipse in Fig. 21.120, show that the product of the slopes PA and PB is −b2/a2.

Fig. 21.120 B(-a, 0) y (0, b) (0, -b) P(x, y) A(a,0)

Fig. 21.120 B(-a, 0) y (0, b) (0, -b) P(x, y) A(a,0) X

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