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Math 11 Chapter 3
Matrices and Determinants
Test 2
1.
Inverse of every matrix exist.
a) True
b) False
2.
The matrix
is in echelon form.
a) True
b) False
3.
= 0
a) True
b) False
4.
A square matrix A= [ a
ij
] is called an upper triangular matrix. If a ∀iji ! j.
a) True
b) False
5.
If A =
then :
a) A
2
b) |A|=0
c) A
4
= 1
2
d) |A|=1
6.
AA
-1
= A
-1
A =
a) O
b) A
c) A
-1
d) I
7.
If n is positive integer then A+A+A----n term:
a) A
n
b) n+A
c) A
2n
d) nA
8.
Minor of an element a
ij
is denoted by:
a) (-1)
i+j
A
ij
b) A
ij
c) |A|
d) M
ij
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