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 An


a)

b)

c)

d)


7.- Solve the equation: XA = I + XB


a) X = (B - A)-1

b) X = (A - B)-1

c) X = A-1- B-1

d) It has no solution


8.- Then X =


a)

b)

c)

d) It has no solution


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.- Solve the system:


a)

b)

c)

d)


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