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+1 vote
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in Mathematics by (67.9k points)

If the circle x+ y2 = a2 intersects the hyperbola xy = c2 in four points P(x1 ,y1), Q(x2 ,y2), R(x3 ,y3), S(x4 ,y4) then

(a)  x1 + x2 + x3 + x4 = 0

(b)  y1 + y2  + y3 + y4 = 0

(c)  x1 x2 x3 x4 = c4 

(d)  y1 y2 y3 y4 = c4

1 Answer

+1 vote
by (63.3k points)
selected by
 
Best answer

Correct option  (a, b, c, d)

Explanation:

solving xy = c2 and x+ y2 = a2 , we get 

x2 +  c4/x2 = a2

x4 – a2x+ c4 = 0 

x1 + x2 + x3  + x4 = 0

x1 .x2 .x3 .x4 = c4

similarly c4/y2 + y2 = a2

y– a2y+ c4  = 0

y1 + y2 + y3 + y4 = 0

y1 .y2 .y4 .y4 = c4

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