![\left[\begin{array}{cc}4&1\\-1&-2\end{array}\right]](/tpl/images/0978/3327/3ed99.png)
![\left[\begin{array}{cc}-5&0\\-4&3\end{array}\right]](/tpl/images/0978/3327/72713.png)
![\left[\begin{array}{cc}14(-5)+1(-4)&(4)0+1(3)\\(-1)(-5)+(-2)(-4)&(-1)0+(-2)(3)\end{array}\right]](/tpl/images/0978/3327/bab04.png)
= ![\left[\begin{array}{cc}-24&3\\13&-6\end{array}\right]](/tpl/images/0978/3327/88d8a.png)
![\left[\begin{array}{cc}(-5)(4)+(0)(-1)&(-5)(1)+(0)(-2)\\(-4)(4)+3(-1)&(-4)(1)+(3)(-2)\end{array}\right]](/tpl/images/0978/3327/4db96.png)
= ![\left[\begin{array}{cc}-20&-5\\-19&-10\end{array}\right]](/tpl/images/0978/3327/2f099.png)
Consider the matrices
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