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19-02-2019
Mathematics

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Determine the value of a so that A = 2i+aj+k and B = 4i-2j-2k are perpendicular

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19-02-2019

in order to make them perpendicular, their dot product must result in zero. so:

[tex]4 \times 2 - 2a - 2 \times 1 = 0[/tex]

[tex]2a = 8 - 2 = 6[/tex]

[tex]a = 3[/tex]

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