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Q.

Circle x2+y2+2x−8y−8=0 and  x2+y2+2x−6y−6=0

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a

touch each other internally at (–1, – 1)

b

touch each other externally at (−1,−1)

c

intersect each other at  (–1, – 1)

d

none of these.

answer is A.

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Detailed Solution

Centre of the first circle is (–1, 4) and its radius is   1+16+8=5 Centre of the second circle is(−1,3)   ) and its radius is  1+9+6=4
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