jika a (3 -5) (2 -2) dan A.b = I dgn I matriks identitas maka b?

jawab

A . B = I
B  = A⁻¹

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