Vectors : Edexcel Core Maths C4 January 2012 Q7(f) : ExamSolutions

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I did this question using the method on your tutorial for the shortest point or distance, and I got 3.4... something, how come when I do it that way it is a different answer? I did it using the x1, y1, z1 method and by equating the coefficients... confused :( 
thanks

SanaEtAsh