If the circle bisects the circumference of the circle

MATHEMATICS · Single correct · CBSE · Mathematics · Conic Sections · Conic Sections

Problem

If the circle x2+y2+4x+22y+c=0x^2 + y^2 + 4x + 22y + c = 0 bisects the circumference of the circle x2+y2−2x+8y−d=0x^2 + y^2 - 2x + 8y - d = 0 , then c+dc + d is equal to (1) 40 (2) 50 (3) 60 (4) 70

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