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Question

Find the equation of the set of the points P such that its distances from the points A(3, 4, –5) and B(–2, 1, 4) are equal.

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Solution

Let P (x, y, z) be any point which is equidistant from A (3,4,5) and B (-2,1,4) .Then,
PA = PB
x-32+y-42+z+52=x+22+y-12+z-42x2-6x+9+y2-8y+16+z2+10z+25=x2+4x+4+y2-2y+1+z2-8z+16x2-6x+9+y2-8y+16+z2+10z+25=x2+4x+4+y2-2y+1+z2-8z+16-10x-6y+18z+29=010x+6y-18z-29=0

Hence, 10x + 6y -18z -29 = 0 is the required equation.

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