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For What Value(s)of a Is the Vector v⃗=−50i⃗+aj⃗+5k⃗\vec { v } = - 50 \vec { i } + a \vec { j } + 5 \vec { k }

question 9

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For what value(s)of a is the vector v⃗=−50i⃗+aj⃗+5k⃗\vec { v } = - 50 \vec { i } + a \vec { j } + 5 \vec { k } perpendicular to the plane z = 10x - 2y + 7?

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