Science:Math Exam Resources/Courses/MATH221/December 2009/Question 05 (a)/Statement

Let

$W=\text{span}\{\left[\begin{array}{c}1\\ 0\\ 3\\ 0\end{array}\right],\left[\begin{array}{c}0\\ 1\\ 4\\ -1\end{array}\right],\left[\begin{array}{c}2\\ -3\\ -6\\ 3\end{array}\right],\left[\begin{array}{c}4\\ -1\\ 8\\ 2\end{array}\right]\}$

Find a basis for $W$.