Circle and chord Watch

Quirky01
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find the distance of the common chord of the circles x²+y²−4x−8y−5=0 and x²+y²−6x+14y−8=0 from the center of the bigger circle..
Need this solution fast..
(a)187/(584)(½). (b).143/(584)^½ (c). 163/(584)^(½) (d).none
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