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Linear Algebra 14 Online
OpenStudy (anonymous):

Find the dimension and state the basis of W \[W = \left \{ \begin{bmatrix} a-2b+5c\\ 2a+5b-8c\\ -a-4b+7c\\ 3a+b+c \end{bmatrix}:a, b, c\textup{ are real numbers} \right \}\]

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