The common tangent of and is

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

Problem

The common tangent of x2+y2=4x^2+y^2=4 and 2x2+y2=22x^2+y^2=2 is (1) x+y+4=0x+y+4=0 (2) x−y+7=0x-y+7=0 (3) 2x+3y+8=02x+3y+8=0 (4) None of these

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