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Q.
If the circle (x-h)
2
+(y-k)
2
=r
2
touches the curve y=x
2
+1 at a point (1, 2), then the possible locations of the points (h, k) are given by
A.
hk=5/2
B.
h+2k=5
C.
h
2
-4k
2
=5
D.
k
2
h
2
+1
E.
None of the above
View Answer
Correct choice: B
Explanation:
Put point (1,2) in each option, only equation h+2k=5 satisfies. Hence option (b) is correct.
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