The equation represents a sphere if

MATHEMATICS · Subjective · CBSE · Mathematics · Conic Sections · Conic Sections

Problem

The equation ax2+by2+cz2+2fyz+2gxz+2hxy+2ux+2vy+2wz+d=0ax^2+by^2+cz^2+2fyz+2gxz+2hxy+2ux+2vy+2wz+d=0 represents a sphere if

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