If one of the circles and lies within the other

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

Problem

If one of the circles x2+y2+2ax+c=0x^2+y^2+2ax+c=0 and x2+y2+2bx+c=0x^2+y^2+2bx+c=0 lies within the other, then (1) ab>0, c>0ab>0,\ c>0 (2) ab>0, c<0ab>0,\ c<0 (3) ab<0, c>0ab<0,\ c>0 (4) ab<0, c<0ab<0,\ c<0

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