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If a="max"{(x+2)^(2)+(y-3)^(2)} and b="m...

If `a="max"{(x+2)^(2)+(y-3)^(2)} and b="min"{(x+2)^(2)+(y-3)^(2)}` where x, y satisfying `x^(2)+y^(2)+8x-10y-40=0` then :

A

`a+b=18`

B

`a+b=178`

C

`a-b=4sqrt(2)`

D

`a-b=72sqrt(2)`

Text Solution

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The correct Answer is:
B, D
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