## College Algebra (6th Edition)

a. $\left[\begin{array}{ll} 6 & 4\\ 5 & 5 \end{array}\right]$ b. $\left[\begin{array}{ll} -10 & 2\\ -5 & -3 \end{array}\right]$ c. $\left[\begin{array}{ll} 8 & -12\\ 0 & -4 \end{array}\right]$ d. $\left[\begin{array}{ll} 10 & 11\\ 10 & 11 \end{array}\right]$
a. $A+B=\left[\begin{array}{ll} -2+8 & 3+1\\ 0+5 & 1+4 \end{array}\right]=\left[\begin{array}{ll} 6 & 4\\ 5 & 5 \end{array}\right]$ b. $A-B=\left[\begin{array}{ll} -2-8 & 3-1\\ 0-5 & 1-4 \end{array}\right]=\left[\begin{array}{ll} -10 & 2\\ -5 & -3 \end{array}\right]$ c. $-4A=\left[\begin{array}{ll} -4(-2) & -4(3)\\ -4(0) & -4(1) \end{array}\right]=\left[\begin{array}{ll} 8 & -12\\ 0 & -4 \end{array}\right]$ d. $3A+2B=\left[\begin{array}{ll} 3(-2)+2(8) & 3(3)+2(1)\\ 3(0)+2(5) & 3(1)+2(4) \end{array}\right]=\left[\begin{array}{ll} 10 & 11\\ 10 & 11 \end{array}\right]$