Question

Matricea A(x)= (1 x ; 2 1 ). x este nr real.. help ..

Answer 1

$A(2)+A(-2)=?$

$A(2)= \left[\begin{array}{ccc}1&2\\2&1\\\end{array}\right]$

$A(-2)= \left[\begin{array}{ccc}1&-2\\2&1\\\end{array}\right]$

$\left[\begin{array}{ccc}1&2\\2&1\\\end{array}\right] + \left[\begin{array}{ccc}1&-2\\2&1\\\end{array}\right] =\left[\begin{array}{ccc}2&0\\4&2\\\end{array}\right]$