Chapter 4 Quadratic Functions and Factoring - 4.2 Graph Quadratic Functions in Vertex or Intercept Form - 4.2 Exercises - Mixed Review - Page 251: 67

$\begin{bmatrix} -1 &8 & -17\\ -6 & 5 & -16 \end{bmatrix}$

Given: $E=\begin{bmatrix} 1 &-2 & 4\\ 3 & -1 & 5 \end{bmatrix}$ $4E=4\begin{bmatrix} 1 &-2 & 4\\ 3 & -1 & 5 \end{bmatrix}=\begin{bmatrix} 4 &-8 & 16\\ 12 & -4 & 20 \end{bmatrix}$ so $\begin{bmatrix} 3&0 & -1\\ 6 & 1 & 4 \end{bmatrix}-\begin{bmatrix} 1 &-2 & 4\\ 3 & -1 & 5 \end{bmatrix}=\begin{bmatrix} -1 &8 & -17\\ -6 & 5 & -16 \end{bmatrix}$