Chapter 2.8, Problem 6E

Let v₁ = $\left[\begin{array}{l}1\\ -2\\ 4\\ 3\end{array}\right]$, v₂ = $\left[\begin{array}{l}4\\ -7\\ 9\\ 7\end{array}\right]$, v₃ = $\left[\begin{array}{l}5\\ -8\\ 6\\ 5\end{array}\right]$, and u = $\left[\begin{array}{l}-4\\ 10\\ -7\\ -5\end{array}\right]$. Determine if u in the subspace of ℝ⁴ generated by {v₁, v₂, v₃}