Fill in the blanks If the distance between the points (a, 2, 1) and (1, –1, 1) is 5, then a _______.
Given points: (a,2,1,) & (1,-1,1)
=5
(a-1)2 + 9 + 0 = 25
a2 – 2a – 15 = 0
(a-5)(a+3) = 0
Thus, a = -3 or a = 5
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