Question

punctul a Pls am nev pt maine

Answer 1

$(\left[\begin{array}{ccc}1&0\\0&1\end{array}\right] +\left[\begin{array}{ccc}1&1\\2&2\end{array}\right])*(\left[\begin{array}{ccc}1&0\\0&1\end{array}\right] + \left[\begin{array}{ccc}a&a\\2a&2a\end{array}\right]) = \left[\begin{array}{ccc}1&0\\0&1\end{array}\right] = \\\left[\begin{array}{ccc}2&1\\2&3\end{array}\right]*\left[\begin{array}{ccc}1+a&a\\2a&1+2a\end{array}\right] = \left[\begin{array}{ccc}1&0\\0&1\end{array}\right]\\\left[\begin{array}{ccc}2+4a&4a+1\\2+8a&8a+3\end{array}\right]$

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

2 + 4a = 1 => 4a = -1 => a = -1/4

4a + 1 = 0 => 4a = -1 => a = -1/4

2 + 8a = 0 => 8a = -2 => a = -1/4

8a + 3 = 1 => 8a = -2 =>a = -1/4