Prove that the equation ax2 + by2 + cz2 + 2ux + 2vy + 2wz + d = 0 represent a cone if u²/a+v²/b+w²/c=d

Prove that the equation ax2 + by2 + cz2 + 2ux + 2vy + 2wz + d = 0 represent a cone if u²/a+v²/b+w²/c=d
 
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