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Let xa n dy be real variables satisfying...

Let `xa n dy` be real variables satisfying `x^2+y^2+8x-10 y-40=0` . Let `a=max{sqrt((x+2)^2+(y-3)^2)}` and `b=min{sqrt((x+2)^2+(y-3)^2)}` . Then

A

`a+b=18`

B

`a-b=4sqrt2`

C

`a+b=4sqrt2`

D

`a.b=73`

Text Solution

Verified by Experts

The correct Answer is:
`:.a+b=18,a-b=4sqrt2,ab=73`
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