Under what condition does the equation x2 + y2 + z2 + 2ux + 2vy +… - Vidyadip

MCQ

Under what condition does the equation x² + y² + z² + 2ux + 2vy + 2wz + d represent a real sphere:

A
u² + v² + w² = d²
B
u² + v² + w² > d
C
u² + v² + w² < d
D
u² + v² + w² < d²

✓

Answer

u² + v² + w² > d

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