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The value of k for which the circles x^2...

The value of k for which the circles `x^2 - y^2 + 3x - 7y +k = 0 and x^2 + y^2 - 4x + 2y - 14 = 0` would intersect orthogonallys

A

`k = -2`

B

`k =-1`

C

`k = 0`

D

`k = 1`

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The correct Answer is:
D
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