The equation of the set of point P, the sum of whose distance from A(4, 0, 0) and B(-4, 0, 0) is equal to 10 is
A. 9x² + 25y² + 25z² + 225 = 0
B. 9x² + 25y² + 25z² – 225 = 0
C. 9x² + 25y² – 25z² – 225 = 0
D. 9x² – 25y² – 25z² – 225 = 0
Answer:B
The equation of the set of point P, the sum of whose distance from A(4, 0, 0) and B(-4, 0, 0) is equal to 10 is
A. 9x² + 25y² + 25z² + 225 = 0 B. 9x² + 25y² + 25z² – 225 = 0 C. 9x² + 25y² – 25z² – 225 = 0 D. 9x² – 25y² – 25z² – 225 = 0