If $\vec { v } = 2 \vec { i } + \vec { j } + 4 \vec { k }$ and $\vec { w } = \vec { i } + \vec { j } - 2 \vec { k }$ , find the value of s so that $\vec { v } + s \vec { w }$ is perpendicular to $\bar { w }$ .

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The Answer of If $\vec { v } = 2 \vec { i } + \vec { j } + 4 \vec { k }$ and $\vec { w } = \vec { i } + \vec { j } - 2 \vec { k }$ , find the value of s so that $\vec { v } + s \vec { w }$ is perpendicular to $\bar { w }$ .

If v⃗=2i⃗+j⃗+4k⃗\vec { v } = 2 \vec { i } + \vec { j } + 4 \vec { k }v=2i+j​+4k

If $\vec { v } = 2 \vec { i } + \vec { j } + 4 \vec { k }$