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Byju's Answer
Standard XII
Mathematics
Null Matrix
If A and B ar...
Question
If A and B are matrices given below :
A =
⎡
⎢
⎣
0
c
−
b
−
c
o
a
b
−
a
0
⎤
⎥
⎦
and B =
⎡
⎢
⎣
a
2
a
b
a
c
a
b
b
2
b
c
a
c
b
c
c
2
⎤
⎥
⎦
then AB is a unit matrix . Is this statement true?
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Solution
False
Correct is that AB is null matrix.
Suggest Corrections
0
Similar questions
Q.
If
A
=
⎡
⎢
⎣
0
c
−
b
−
c
0
a
b
−
a
0
⎤
⎥
⎦
and
B
=
⎡
⎢
⎣
a
2
a
b
a
c
a
b
b
2
b
c
a
c
b
c
c
2
⎤
⎥
⎦
,
then
A
B
=
Q.
lf
A
=
⎡
⎢
⎣
o
c
−
b
−
c
o
a
b
−
a
o
⎤
⎥
⎦
a
n
d
B
=
⎡
⎢
⎣
a
2
a
b
a
c
a
b
b
2
b
c
a
c
b
c
c
2
⎤
⎥
⎦
,
then
A
B
=
Q.
If
A
=
⎡
⎢
⎣
0
c
−
b
−
c
0
a
b
−
a
0
⎤
⎥
⎦
and
B
=
⎡
⎢
⎣
a
2
a
b
a
c
b
a
b
2
b
c
c
a
c
b
c
2
⎤
⎥
⎦
then
A
B
is equal to
Q.
If
A
=
⎡
⎢
⎣
0
c
−
b
−
c
0
a
b
−
a
0
⎤
⎥
⎦
,
B
=
⎡
⎢
⎣
a
2
a
b
a
c
b
a
b
2
b
c
c
a
c
b
c
2
⎤
⎥
⎦
then
A
B
=
Q.
If
A
=
⎡
⎢
⎣
a
2
a
b
a
c
a
b
b
2
b
c
a
c
b
c
c
2
⎤
⎥
⎦
and
a
2
+
b
2
+
c
2
=
1
then
A
2
=
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