# Chapter 4 - Vector Spaces - 4.1 Exercises - Page 198: 18

$u=\left[\begin{array}{l} 4\\ 0\\ 1\\ -2 \end{array}\right], v=\left[\begin{array}{l} 3\\ 0\\ 1\\ 0 \end{array}\right],w=\left[\begin{array}{l} 0\\ 0\\ 1\\ 1 \end{array}\right]$ $W=$Span$\{u,v,w\}$

#### Work Step by Step

If $v_{1},v_{2}...,v_{p}$ are in a vector space $V$, then Span $\{v_{1},v_{2}...,v_{p}\}$ is a subspace of V. ------------ $\left[\begin{array}{l} 4a+3b\\ 0\\ a+b+c\\ c-2a \end{array}\right]=a\left[\begin{array}{l} 4\\ 0\\ 1\\ -2 \end{array}\right]+b\left[\begin{array}{l} 3\\ 0\\ 1\\ 0 \end{array}\right]+c\left[\begin{array}{l} 0\\ 0\\ 1\\ 1 \end{array}\right]$ $u=\left[\begin{array}{l} 4\\ 0\\ 1\\ -2 \end{array}\right], v=\left[\begin{array}{l} 3\\ 0\\ 1\\ 0 \end{array}\right],w=\left[\begin{array}{l} 0\\ 0\\ 1\\ 1 \end{array}\right].$ $u,v,w\in \mathbb{R}^{4}$,and $W=$Span$\{u,v,w\}$, so , by Theorem 1, $W$ is a subspace of $\mathbb{R}^{4}.$

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