find the equation of the set of point P. the sum of whose distance A(4, 0,9) and B(-4, 0,0) is equal to 10.
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The coordinates of points A and B are (4, 0, 0) and (–4, 0, 0) respectively. It is given that PA + PB = 10. Thus, the required equation is 9x2 + 25y2 + 25z2 – 225 = 0.0
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