Your Practice Set – Applications and Interpretation for IBDP Mathematics SE Production Limited 80 1 . Let 2 4 1 3 5 3 1 0 1 � � � � � � � � � � � � � � A and 2 2 4 x x x � � � � � � � B . ( a ) Write down det A . [ 1 ] ( b ) Find det B . [ 2 ] ( c ) Solve the equation ( 11 det ) det x � � A B . [ 2 ] 2 . Let 3 1 1 0 2 5 1 0 1 � � � � � � � � � � � � � A and 1 2 1 x x x x � � � � � � � � � � B . ( a ) Write down det A . [ 1 ] ( b ) Find det B . [ 2 ] ( c ) Solve the equation det det 5 0 x � � � A B . [ 3 ] 3 . Let 2 4 1 3 x x e e � � � � � � � A . ( a ) Find det A . [ 2 ] ( b ) Solve the equation det 1 0 � � A . [ 3 ] 4 . Let ln 3 2 ln x x � � � � � � � � A . ( a ) Find det A . [ 2 ] ( b ) Solve the equation det 5ln x � A , giving the answer ( s ) in terms of e . [ 4 ] Exercise 25