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The position vector of P and Q are 5i+4j+ak and -i+2j-2k respectively. If the distance between them is 7. Find the value of a.

I'm a tad rusty, but basically you receive two points:(5,4,a) ; (-1,2,2)Calculate the euclidean distance, equate to 7 and solve for a.(x2 - x1)^2 + (y2 - y1)^2 + (z2 - z1)^2 = d^2

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