Exam

Exam

1. Let

calculate 3A - 5B


a)

b)

c)

d)


2. Calculate A·B


a)

b)

c)

d)


3.- Calculate At + Bt


a)

b)

c)

d)


4.- Find A-1


a)

b)

c)

d) A is a singular matrix


5.- Find B-1


a)

b)

c)

d) B is a singular matrix


6.- Calculate 5BA


a) 

b) 

c)

d) 


7.- Calculate B·A-1


a)

b)

c)

d) A is a singular matrix


8.- Calculate B2


a) 

b) 

c) 

d)


9.- Find a, b and c to make that:


a) a = -5, b = 4, c = 5

b) a = 5, b = 4, c = -2

c) a = 3, b = 4, c = -2

d) a = 5, b = 4, c = -5


10.- Let the matrix:

which of the following sentences is false?


a) It is a symmetric matrix

b) It is a triangular matrix

c) Its trace equals 0

d) All of them are true


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