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If the circle x^2+y^2=a^2 intersects the...

If the circle `x^2+y^2=a^2` intersects the hyperbola `x y=c^2` at four points `P(x_1, y_1),Q(x_2, y_2),R(x_3, y_3),` and `S(x_4, y_4),` then `x_1+x_2+x_3+x_4=0` `y_1+y_2+y_3+y_4=0` `x_1x_2x_3x_4=C^4` `y_1y_2y_3y_4=C^4`

A

`x_(1)+x_(2)+x_(3)+x_(4)=0`

B

`y_(1)+y_(2)+y_(3)+y_(4)=0`

C

`x_(1)x_(2)x_(3)x_(4)=c^(4)`

D

`y_(1)y_(2)y_(3)y_(4)=c^(4)`

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
Solving `xy=c^(2) and x^(2)+y^(2)=a^(2)`, we have
`x^(2)+(c^(4))/(x^(2))=a^(2)`
`"or "x^(4)-a^(2)x^(2)+c^(4)=0`
`therefore" "Sigmax_(i)=0 and x_(1)x_(2)x_(3)x_(4)=c^(4)`
Similarly, if we eliminate y, then `Sy_(i)=0 and y_(1)y_(2)y_(3)y_(4)=c^(4)` .
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