Question

A=(4 1 6-2) e i2
A.i2

Answer 1

$A= \left[\begin{array}{cc}4&1\\6&-2\\\end{array}\right] \\ \\ \\ I_2= \left[\begin{array}{cc}1& 0\\0&1\\\end{array}\right]$

$A*I_2 =\\ \\ \left[\begin{array}{cc}4&1\\6&-2\\\end{array}\right]*\left[\begin{array}{cc}1& 0\\0&1\\\end{array}\right] =\\ \\ \left[\begin{array}{cc}4*1+1*0&4*0+1*1\\6*1+(-2)*0&6*0+(-2)*1\\\end{array}\right]= \\ \\ \boxed{\boxed{\left[\begin{array}{cc}4&1\\6&-2\\\end{array}\right] }}$