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8 May, 13:08

What values of a make v = 2a i - a j + 32k perpendicular to w = 6 i + a j - k? (enter your answers as a comma-separated list.) a = ?

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  1. 8 May, 13:30
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    Taking the Dot Product = 0 shows perpendicular or orthagonal vectors.

    Then 2ax6 - axa + 32x (-1) = 0

    a^2 - 12A + 32 = 0

    (a-8) (a-4) = 0

    a = 4,8
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