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![\vec{u}=[-5;-9]\\\vec{v}=[6;\ 8]\\\\-8\vec{u}-2\vec{v}=-8\cdot[-5;-9]-2\cdot[6;\ 8]\\\\=[(-9)(-5);(-8)(-9)]-[(2)(6);\ (2)(8)]\\\\=[40;\ 72]-[12;\ 16]=[40-12;\ 72-16]\\\\=\boxed{[28;\ 56]}](/tpl/images/0099/0490/28fdd.png)
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Let u = < -5, -9> , v = < 6, 8> . find -8u - 2v....
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