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Let v and w be vectors such that \(\operatorname{proj}_{{w}}({v})= \begin{pmatrix} 4 \\ -7 \end{pmatrix}.\)
Find \(\operatorname{proj}_{-2{w}} (3{v})\).

 Oct 9, 2019
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The answer is [20,-35].

 Nov 2, 2019

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