tolong bantu nomor 2 sm 3 essai pake cara. makasih

jawab

2)
a) 

[tex] A+B\,= \left[\begin{array}{ccc}1&1\\-3&2\end{array}\right]\,+ \left[\begin{array}{ccc}-2&4\\-1&-3\end{array}\right]\,= \left[\begin{array}{ccc}1&5\\-4&-5\end{array}\right] [/tex]

det|A+B| = -1(-1) - 5(-4) = 1 + 20 = 21

[tex] b).\, A^{-1}\,= \frac{1}{1(2)-1(-3)} \left[\begin{array}{ccc}2&-1\\3&1\end{array}\right]\,= \frac{1}{5}\left[\begin{array}{ccc}2&-1\\3&1\end{array}\right] [/tex]

[tex]AB\,= \left[\begin{array}{ccc}-3&1\\4&-18\end{array}\right] [/tex]

3)

C= A+B

[tex] C\,= \left[\begin{array}{ccc}7&4\\7&11\end{array}\right] [/tex]

det C = 7(11) - 7(4) = 49