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    IBHardVectors10–12

    For which value of kk are a⃗=(3,k,2)\vec{a} = (3, k, 2) and b⃗=(1,2,−4)\vec{b} = (1, 2, -4) perpendicular?

    Para que valor de kk são a⃗=(3,k,2)\vec{a} = (3, k, 2) e b⃗=(1,2,−4)\vec{b} = (1, 2, -4) perpendiculares?

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    Solution

    Step 1 of 4

    1. 1.Perpendicular means a⃗⋅b⃗=0\vec{a} \cdot \vec{b} = 0