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=sqrt(2)` (c) `a-b=4sqrt(2)` (d) `adotb=73`

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