If \(A = \left[ {\begin{array}{*{20}{c}} 1&{ - 1}\\ { - 1}&1 \end{array}} \right],\) then the expression A3 - 2A2 is

If \(A = \left[ {\begin{array}{*{20}{c}} 1&{ - 1}\\ { - 1}&1 \end{arra

1.	If \(A = \left[ {\begin{array}{*{20}{c}} 1&{ - 1}\\ { - 1}&1 \end{array}} \right],\) then the expression A3 - 2A2 is
A.	a null matrix
B.	an identify matrix
C.	equal to A
D.	equal to -A
Answer» B. an identify matrix